How many letters does the top answer for “containing three letters or characters, or three sets of letters or characters.” have?

The most common answer is trigrammatic (12 letters).

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Crossword clue: containing three letters or characters, or three sets of letters or characters.

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

trigrammatic 12 letters web-def

Containing three letters or characters, or three sets of letters or characters.

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)