How many letters does the top answer for “a formal entry into an organization or position or office” have?

The most common answer is induction (9 letters).

Crossword clue: a formal entry into an organization or position or office

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

induction 9 letters wn-def

a formal entry into an organization or position or office

initiation 10 letters wn-def

a formal entry into an organization or position or office