half

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. One of two equal parts that together constitute a whole.
2. n. One part approximately equal to the remaining part.
3. n. Informal A 50-cent piece.
4. n. Sports One of the two playing periods into which certain games are divided.
5. n. Sports A halfback.
6. n. Chiefly British A school term; a semester.
7. n. Half an hour: a half past one.
8. adj. Being one of two equal parts.
9. adj. Being approximately a half.
10. adj. Partial or incomplete: gave me a half smile.
11. adv. To the extent of exactly or nearly 50 percent: The tank is half empty.
12. adv. Not completely or sufficiently; partly: only half right.
13. idiom. by half By a considerable extent.
14. idiom. by half By an excessive amount: too clever by half.
15. idiom. by halves In a reluctant manner; unenthusiastically.
16. idiom. many One-and-a-half times more; 50 percent more.
17. idiom. in half Into halves.
18. idiom. not half Not at all: "Fancy housing? Not half likely, ma'am” ( Russell Baker).
19. idiom. not the half of Only a fraction or a small part of.

Century Dictionary and Cyclopedia

1. Being one of two equal parts; consisting of a moiety: as, a half share in an enterprise; a half ticket in a lottery.
2. n. A side; a part.
3. n. Part; behalf; account; sake.
4. n. One of two equal parts of anything that is divisible, or that may be regarded as divisible; a moiety: usually not followed by of unless preceded by a qualifying word: as, half the miseries or pleasures of life; half a pound; half an orange; the half, one half, or the other half of an orange.
5. n. Among schoolboys in England, a session; the term between vacations: a contraction of half-year. Sometimes there are three “halves” in the year.
6. n. In foot-ball, a half-back. See back, n., 12.
7. To divide into halves; halve; hence, loosely, to separate into parts of any relative size.
8. In an equal part or degree; by half; hence, in part; to some extent: much used in composition, and often indefinite: as, half-baked; half-dead; half-educated; half-starved.
9. An erroneous form of haft.

Wiktionary

1. adj. Consisting of a moiety, or half (1/2, 50%).
2. adj. Consisting of some indefinite portion resembling a half; approximately a half, whether more or less; partial; imperfect.
3. adj. of a sibling Having one parent (rather than two) in common.
4. adj. rare Related through one common grandparent or ancestor rather than two.
5. adj. UK, time Half an hour after the time given; half past.
6. adv. In two equal parts or to an equal degree; in some part approximating a half; partially; imperfectly.
7. n. One of two equal parts into which anything may be divided, or considered as divided; — sometimes followed by of; as, a half of an apple.
8. n. Half of a standard measure; frequently used (UK) for half a pint of beer or cider.
9. n. preceded by “a” or a number The fraction obtained by dividing 1 by 2.
10. n. obsolete part; side; behalf.
11. v. transitive, obsolete To halve.

GNU Webster's 1913

1. adj. Consisting of a moiety, or half
2. adj. Consisting of some indefinite portion resembling a half; approximately a half, whether more or less; partial; imperfect.
3. adv. In an equal part or degree; in some part approximating a half; partially; imperfectly.
4. n. obsolete Part; side; behalf.
5. n. One of two equal parts into which anything may be divided, or considered as divided; -- sometimes followed by of.
6. v. To halve. [Obs.] See halve.

WordNet 3.0

1. adj. partial.
2. n. one of two divisions into which some games or performances are divided: the two divisions are separated by an interval
3. adv. partially or to the extent of a half
4. adj. (of siblings) related through one parent only
5. adj. consisting of one of two equivalent parts in value or quantity
6. n. one of two equal parts of a divisible whole