How many letters does the top answer for “inventing or contriving an idea or explanation and formulating it mentally” have?

The most common answer is conceptualisation (17 letters).

Crossword clue: inventing or contriving an idea or explanation and formulating it mentally

conceptualisation, conceptualization.

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

conceptualisation 17 letters wn-def

inventing or contriving an idea or explanation and formulating it mentally

conceptualization 17 letters wn-def

inventing or contriving an idea or explanation and formulating it mentally