How many letters does the top answer for “teaching or impressing upon the mind by frequent instruction or repetition” have?

The most common answer is inculcation (11 letters).

Crossword clue: teaching or impressing upon the mind by frequent instruction or repetition

inculcation, ingraining, instilling.

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

inculcation 11 letters wn-def

teaching or impressing upon the mind by frequent instruction or repetition

ingraining 10 letters wn-def

teaching or impressing upon the mind by frequent instruction or repetition

instilling 10 letters wn-def

teaching or impressing upon the mind by frequent instruction or repetition