How many letters does the top answer for “helpful in bringing about a harmonious adaptation” have?

The most common answer is accommodating (13 letters).

Crossword clue: helpful in bringing about a harmonious adaptation

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

accommodating 13 letters wn-def

helpful in bringing about a harmonious adaptation

accommodative 13 letters wn-def

helpful in bringing about a harmonious adaptation