halve

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To divide (something) into two equal portions or parts.
2. v. To lessen or reduce by half: halved the recipe to serve two.
3. v. Informal To share (something) equally: The twins halve everything.
4. v. Sports To play (a golf game or hole) using the same number of strokes as one's opponent.

Century Dictionary and Cyclopedia

1. To divide into two parts, especially two equal parts or halves.
2. To join, as two pieces of timber, by cutting away one half or an equal portion in depth of each, so as to let them into each other. This is done to produce either a lap-joint, a dovetail, a scarf, or a notched joint or common halving. The upper figure represents the simple lap-joint, and the lower one the common halving.
3. n. An obsolete variant of half.

Wiktionary

1. v. To reduce to half the original amount.
2. v. To divide into two halves.

GNU Webster's 1913

1. n. A half.
2. v. To divide into two equal parts; ; to be or form half of.
3. v. To join, as two pieces of timber, by cutting away each for half its thickness at the joining place, and fitting together.
4. v. Of a hole, match, etc., to reach or play in the same number of strokes as an opponent.

WordNet 3.0

1. v. divide by two; divide into halves