How many letters does the top answer for “relating to or showing a difference” have?

The most common answer is differential (12 letters).

Crossword clue: relating to or showing a difference

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

differential 12 letters wn-def

the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx

of or relating to or showing technophilia 50% similar → technophilic

of or relating to or showing technophobia 50% similar → technophobic

relating to, or showing, geotropism. 50% similar → geotropic