How many letters does the top answer for “the production or use of theories” have?

The most common answer is theorisation (12 letters).

Crossword clue: the production or use of theories

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

theorisation 12 letters wn-def

the production or use of theories

theorization 12 letters wn-def

the production or use of theories

by the use of probability theory 50% similar → probabilistically