How many letters does the top answer for “one of two equal parts of a divisible whole” have?

The most common answer is half (4 letters).

Crossword clue: one of two equal parts of a divisible whole

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

half 4 letters wn-def

one of two equal parts of a divisible whole

one of three equal parts of a divisible whole 71% similar → third, tierce

one of two (approximately) equal parts 57% similar → mediety

divisible into two parts. 50% similar → bipartile