to

American Heritage® Dictionary of the English Language, Fourth Edition

1. prep. In a direction toward so as to reach: went to the city.
2. prep. Towards: turned to me.
3. prep. Reaching as far as: The ocean water was clear all the way to the bottom.
4. prep. To the extent or degree of: loved him to distraction.
5. prep. With the resultant condition of: nursed her back to health.
6. prep. Toward a given state: helping minority women to economic equality.
7. prep. In contact with; against: their faces pressed to the windows.
8. prep. In front of: stood face to face.
9. prep. Used to indicate appropriation or possession: looked for the top to the jar.
10. prep. Concerning; regarding: waiting for an answer to my letter.
11. prep. In a particular relationship with: The brook runs parallel to the road.
12. prep. As an accompaniment or a complement of: danced to the tune.
13. prep. Composing; constituting: two cups to a pint.
14. prep. In accord with: job responsibilities suited to her abilities.
15. prep. As compared with: a book superior to his others.
16. prep. Before: The time is ten to five.
17. prep. Up till; until: worked from nine to five.
18. prep. For the purpose of: went out to lunch.
19. prep. In honor of: a toast to the queen.
20. prep. Used before a verb to indicate the infinitive: I'd like to go.
21. prep. Used alone when the infinitive is understood: Go if you want to.
22. prep. Used to indicate the relationship of a verb with its complement: refer to a dictionary; refer me to a dictionary.
23. prep. Used with a reflexive pronoun to indicate exclusivity or separateness: had the plane to ourselves.
24. adv. In one direction; toward a person or thing: owls with feathers wrong end to.
25. adv. Into a shut or closed position: pushed the door to.
26. adv. Into a state of consciousness: The patient came to.
27. adv. Into a state of action or attentiveness: sat down for lunch and fell to.
28. adv. Nautical Into the wind.

Century Dictionary and Cyclopedia

1. A word used to express the relation of direction or tendency, with many modified and related senses.
2. In the direction of; unto; toward: indicating direction or motion toward a place, point, goal, state, condition, or position, or toward something to be done or to be treated: opposed to from.
3. As far as: indicating a point or limit reached or to be reached in space, time, or degree; expressing extent of continuance, or proceeding, or degree of comprehension, or inclusion.
4. For; unto: indicating an actual or supposed limit to movement or action, or denoting destination, design, purpose, or aim: as, the horse is broken to saddle or harness.
5. Unto: indicating a result or effect produced; denoting a consequence or end: as, he was flattered to his ruin; it was reported to her shame.
6. Upon; besides: denoting addition, contribution, or possession.
7. Upon; on: denoting contact, junction, or union.
8. Compared with: denoting comparison, proportion, or measure. Hence it is used in a strictly limited sense in expressing ratios or proportions: as, three is to twelve as four is to sixteen.
9. Against; over against: denoting opposition, contrast, or antithesis: as, to wager three to one; they engaged hand to hand.
10. In accordance, congruity, or harmony with: denoting agreement, adaptation, or adjustment: as, a plan drawn to scale; painted to the life.
11. In accompaniment with: as, she sang to his guitar.
12. In the character, quality, or shape of; for; as.
13. Regarding; concerning: as to: denoting relation: as, to plead to the charge; to speak to the question.
14. Denoting application or attention: as, he fell to work.
15. In connection with; appurtenant: denoting attribution, appurtenance, or belonging: as, a cap with a tassel to it.
16. In a great variety of cases to supplies the place of the dative in other languages: it connects transitive verbs with their indirect or distant objects, and adjectives, nouns, and neuter or passive verbs with a following noun which limits their action.
17. After adjectives, it points to the person or thing with respect to which, or in whose interest, a quality is shown or perceived: as, a substance sweet to the taste; an event painful to the mind.
18. To is used as ordinary “sign” of the infinitive (like the corresponding zu in German, à and de in French, a and di in Italian, att in Swedish, etc). In Anglo-Saxon, the verbal noun after tō took a special dative form—e. g., tō etanne, ‘to or for eating’—distinguishing it from the simple intinitive, as etan; but this distinction of form has been long since lost, and the two constructions have also been confounded and mixed.
19. To is not used before the infinitive after the ordinary auxiliaries, as do, will, can, may, etc.; also not after various other verbs, as, see, hear, let, etc.; while after a few it is sometimes omitted or sometimes retained against more common usage to the contrary. After a noun or an adjective to is always used.
20. To was formerly used even after another preposition, especially for, and is still so used dialectally and vulgarly: as, what are you going for to do? Rarely after other prepositions, as from; but very commonly after about, about to signifying immediate futurity: as, he is about to go.
21. After be and have, the infinitive with to denotes something future, especially with the implication of duty or necessity: as, it is still to do (or to be done); I have it to do (or have to do it).
22. Colloquially, an inflnitive after to, when it is a repetition of a preceding inflnitive, is often omitted: as, I don't go because I don't wish to.
23. In various obsolete, provincial, or colloquial uses: after; against; at; by; for; in; of; on; with; before; etc.
24. To a place in view; forward; on.
25. To the thing to be done: denoting motion and application to a thing.
26. To its place; together: denoting the joining or closing of something separated or open: as, shut the door to.
27. In a certain direction: as, sloped to.
28. Till.
29. An old spelling of too, toe, two.
30. n. A Japanese grain and liquid measure containing 1097.52 cubic inches, or a little less than half an imperial bushel.
31. n. A prefix of Anglo-Saxon origin, being the preposition and adverb to so used: as in toname. In to-day, to-morrow, to-month, to-night, to-year, it is not properly a prefix, but the preposition coalesced with its noun. In to-ward it is the adverb as the principal element, with suffix -ward.
32. n. A prefix of Anglo-Saxon origin, meaning ‘apart, away,’ and denoting separation, negation, or intensity It is common in Anglo-Saxon and Middle English, but is almost wholly obsolete in English. A relic of its use remains in the archaic all to used as a quasi-adverb in all to break, all to split, all to broken, etc., where the adverb is really all, and to is properly a prefix of the verb, tobreak, tosplit, etc., in early modern English separated from the verb (being in Middle English, like other prefixes, commonly written separate), and often written with all as one word, alto, taken as an adverb qualifying the verb. (See all, adv., 1.) Such verbs are properly written without a hyphen; examples are tobeat, tobear, tobits, toblast toblow, toburst (tobrest), tobruise, todeal, tofall. This prefix is often confused, by readers and editors of Middle English texts, with the preposition to, the sign of the infinitive.

Wiktionary

1. prep. A particle used for marking the following verb as an infinitive.
2. prep. As above, with the verb implied.
3. prep. Indicating destination: In the direction of, and arriving at.
4. prep. Used to indicate purpose.
5. prep. Indicating a necessity.
6. prep. Used to indicate result of action.
7. prep. Used after an adjective to indicate its application.
8. prep. arithmetic Used to indicate ratios; in informal use the ratios are not reduced to smallest terms.
9. prep. arithmetic Used to indicate that the preceding term is to be raised to the power of the following value; indicates exponentiation.
10. prep. Used to indicate the indirect object.
11. prep. time Preceding.
12. prep. Canada, UK, Newfoundland, West Midlands at
13. adv. Toward a closed, touching or engaging position.
14. adv. nautical Into the wind.
15. adv. common misspelling of too.

GNU Webster's 1913

1. n. [Colloq.] to spend more than one's income; to get into debt.
2. n. to put one in a position to go on; to assist to start.
3. prep. The preposition to primarily indicates approach and arrival, motion made in the direction of a place or thing and attaining it, access; and also, motion or tendency without arrival; movement toward; -- opposed to from.
4. prep. Hence, it indicates motion, course, or tendency toward a time, a state or condition, an aim, or anything capable of being regarded as a limit to a tendency, movement, or action.
5. prep. In a very general way, and with innumerable varieties of application, to connects transitive verbs with their remoter or indirect object, and adjectives, nouns, and neuter or passive verbs with a following noun which limits their action. Its sphere verges upon that of for, but it contains less the idea of design or appropriation.
6. prep. As sign of the infinitive, to had originally the use of last defined, governing the infinitive as a verbal noun, and connecting it as indirect object with a preceding verb or adjective; thus, ready to go, i.e., ready unto going; good to eat, i.e., good for eating; I do my utmost to lead my life pleasantly. But it has come to be the almost constant prefix to the infinitive, even in situations where it has no prepositional meaning, as where the infinitive is direct object or subject; thus, I love to learn, i.e., I love learning; to die for one's country is noble, i.e., the dying for one's country. Where the infinitive denotes the design or purpose, good usage formerly allowed the prefixing of for to the to.
7. prep. In many phrases, and in connection with many other words, to has a pregnant meaning, or is used elliptically.
8. prep. Extent; limit; degree of comprehension; inclusion as far as.
9. prep. Effect; end; consequence.
10. prep. Apposition; connection; antithesis; opposition; as, they engaged hand to hand.
11. prep. Accord; adaptation.
12. prep. Comparison.
13. prep. Addition; union; accumulation.
14. prep. Accompaniment.
15. prep. In this sense archaic Character; condition of being; purpose subserved or office filled.