How many letters does the top answer for “a meeting of heads of governments” have?

The most common answer is summit (6 letters).

Crossword clue: a meeting of heads of governments

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

summit 6 letters wn-def

a meeting of heads of governments

head of government scientist 50% similar → nitithada

the head of a city government 50% similar → mayor

the head of a state government 50% similar → governor