true

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Consistent with fact or reality; not false or erroneous. See Synonyms at real¹. See Usage Note at fact.
2. adj. Truthful.
3. adj. Real; genuine. See Synonyms at authentic.
4. adj. Reliable; accurate: a true prophecy.
5. adj. Faithful, as to a friend, vow, or cause; loyal. See Synonyms at faithful.
6. adj. Sincerely felt or expressed; unfeigned: true grief.
7. adj. Fundamental; essential: his true motive.
8. adj. Rightful; legitimate: the true heir.
9. adj. Exactly conforming to a rule, standard, or pattern: trying to sing true B.
10. adj. Accurately shaped or fitted: a true wheel.
11. adj. Accurately placed, delivered, or thrown.
12. adj. Quick and exact in sensing and responding.
13. adj. Determined with reference to the earth's axis, not the magnetic poles: true north.
14. adj. Conforming to the definitive criteria of a natural group; typical: The horseshoe crab is not a true crab.
15. adj. Narrowly particularized; highly specific: spoke of probity in the truest sense of the word.
16. adj. Computer Science Indicating one of two possible values taken by a variable in Boolean logic or a binary device.
17. adv. In accord with reality, fact, or truthfulness.
18. adv. Unswervingly; exactly: The archer aimed true.
19. adv. So as to conform to a type, standard, or pattern.
20. v. To position (something) so as to make it balanced, level, or square: trued up the long planks.
21. n. Truth or reality. Used with the.
22. n. Proper alignment or adjustment: out of true.

Century Dictionary and Cyclopedia

1. n. in eccles. law, an expression formerly used at the end of each several article in the libel as descriptive of the charges therein contained.
2. Conformable to fact; being in accordance with the actual state of things; not false, fictitious, or erroneous: as, a true story; a true statement.
3. What proposition is there respecting human nature which is absolutely and universally true?
4. Conformable to reason or to established rules or custom; exact; just; accurate; correct.
5. Conformable to law and justice; legitimate; rightful: as, the true heir.
6. Conformable to nature; natural; correct.
7. In biology:
8. Conforming or conformable to a type, norm, or standard of structure; typical; as, an amœba is a true animal; a canary is a true bird; the lion is a true cat; a frog or toad is not a true reptile.
9. Genuine; truebred; not hybrid or mongrel: as, a true merino sheep. Also used adverbially: as, to breed true.
10. Genuine; pure; real; not counterfeit, adulterated, false, or pretended.
11. In anatomy, complete; perfected: as, true ribs (that is, those which articulate with the breastbone, as distinguished from false or floating ribs); the true pelvis (that part of the pelvis below the superior strait or iliopectineal line); a true corpus luteum (the complete corpus luteum of pregnancy, as distinguished from the same body unaffected by the result of conception).
12. Free from falsehood; habitually speaking the truth; veracious; truthful.
13. Firm or steady in adhering to promises, to friends, to one's principles, etc.; not fickle, false, or perfidious; faithful; constant; loyal.
14. Honest.
15. Sure; unerring; unfailing.
16. Synonyms Veritable, actual. See reality.
17. 8 and Sincere, honorable.
18. n. Truth; fidelity.
19. n. Agreement; covenant; pledge.
20. n. A temporary cessation of war, according to agreement; respite from war; truce. See truce.
21. To verify.
22. To make true in position, form, adjustment, or the like: give a right form to; adjust nicely; put a keen, fine, or smooth edge on; make exactly straight, square, plumb, level, or the like: a workmen's term.

Wiktionary

1. adj. of a statement Conforming to the actual state of reality or fact; factually correct.
2. adj. logic A state in Boolean logic that indicates an affirmative or positive result.
3. adj. Loyal, faithful.
4. adj. Genuine.
5. adj. Legitimate.
6. adj. shooting, golf, etc. Accurate; following a path toward the target.
7. adv. Accurately.
8. n. Truth.
9. n. The state of being in alignment.
10. v. To straighten.
11. v. To make even, level, symmetrical, or accurate, align; adjust.

GNU Webster's 1913

1. adj. Conformable to fact; in accordance with the actual state of things; correct; not false, erroneous, inaccurate, or the like.
2. adj. Right to precision; conformable to a rule or pattern; exact; accurate.
3. adj. Steady in adhering to friends, to promises, to a prince, or the like; unwavering; faithful; loyal; not false, fickle, or perfidious.
4. adj. Actual; not counterfeit, adulterated, or pretended; genuine; pure; real.
5. adj. (Biol.) Genuine; real; not deviating from the essential characters of a class.
6. adv. In accordance with truth; truly.

WordNet 3.0

1. adv. as acknowledged
2. adj. determined with reference to the earth's axis rather than the magnetic poles
3. adj. not pretended; sincerely felt or expressed
4. adj. accurately placed or thrown
5. adj. in tune; accurate in pitch
6. adj. worthy of being depended on
7. adj. having a legally established claim
8. adj. consistent with fact or reality; not false
9. adj. rightly so called
10. adj. devoted (sometimes fanatically) to a cause or concept or truth
11. adj. expressing or given to expressing the truth
12. adj. accurately fitted; level.
13. n. proper alignment; the property possessed by something that is in correct or proper alignment
14. v. make level, square, balanced, or concentric
15. adj. conforming to definitive criteria