How many letters does the top answer for “the state of being complete.” have?

The most common answer is completeness (12 letters).

Crossword clue: the state of being complete.

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

completeness 12 letters web-def

the state of being complete and entire; having everything that is needed

the state of being total and complete 75% similar → entireness, entirety, integrality

a state of being compact. 50% similar → compactedness

a state of being confined 50% similar → custody, detainment

a state of being frozen. 50% similar → frozenness

a state of being noteless. 50% similar → notelessness

being in a state of abeyance. 50% similar → abeyant

being in a tense state 50% similar → edgy, jittery, uptight

state of being a client. 50% similar → cliency