Antonym: whole. Similar words: in half, halfway, behalf, on behalf of, whale, hallway, shallow, malfunction. Meaning: [hælf] 
n. 1. one of two equal parts of a divisible whole 2. in various games or performances: either of two periods of play separated by an interval. adj. 1. consisting of one of two equivalent parts in value or quantity 2. partial 3. (of siblings) related through one parent only. adv. partially or to the extent of a half.
n. 1. one of two equal parts of a divisible whole 2. in various games or performances: either of two periods of play separated by an interval. adj. 1. consisting of one of two equivalent parts in value or quantity 2. partial 3. (of siblings) related through one parent only. adv. partially or to the extent of a half. 
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1. A good beginning is half the battle. 
2. A maid that laughs is half taken.
3. A bold attempt is half success.
4. He who wills success is half way to it.
5. Better be half hanged than ill wed.
6. A good beginning is half done.
7. A disease known is half cured.
8. Half a loaf is better then no bread.
9. First impressions are half the battle.
10. The first step is as good as half over.
11. The first blow is half the battle.
12. Half a loaf is better than no bread.
13. To know the disease is half the cure.
14. Better half an egg than empty shell.
15. Half a tale is enough for a wise man.
16. A fault confessed is half redressed.
17. A danger foreseen is half avoided.
18. Knowledge without practice makes but half an artist.
19. Well begun is half done.
20. One half of the world does not know how the other half lives.
21. Half the world knows not how the other half lives.
22. Keep your eyes wide open before marriage,(sentencedict.com/half.html) and half shut afterwards.
23. Spoil (or Lose) the ship for half penny worth of tar.
24. A man without a friend is only half a man.
25. Half a tale [word] is enough for a wise man.
26. Believe not all that you see nor half what you hear.
27. Life is half spent before we know what it is. George Herbert
28. Nothing for nothing and very little for a half penny.
29. They're selling off last year's stock at half price.
30. To feel that one has a place in life solves half the problem of content.
More similar words: in half, halfway, behalf, on behalf of, whale, hallway, shallow, malfunction, hallelujah, challenged.