How many letters does the top answer for “the state of being a married couple voluntarily joined for life (or until divorce)” have?

The most common answer is marriage (8 letters).

Crossword clue: the state of being a married couple voluntarily joined for life (or until divorce)

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

marriage 8 letters wn-def

the state of being a married couple voluntarily joined for life (or until divorce)

matrimony 9 letters wn-def

the state of being a married couple voluntarily joined for life (or until divorce)

wedlock 7 letters wn-def

the state of being a married couple voluntarily joined for life (or until divorce)