How many letters does the top answer for “having a meaning or purpose” have?

The most common answer is meaningful (10 letters).

Crossword clue: having a meaning or purpose

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

meaningful 10 letters wn-def

having a meaning or purpose

having no meaning or direction or purpose 60% similar → meaningless, nonmeaningful

of words; having many meanings 50% similar → polysemous

of words: having opposite meanings 50% similar → antonymous