defining characteristic

Most distinguishing feature

A defining characteristic is a quality or feature so essential to something that it determines what that thing is.

Without it, the thing would be fundamentally different or unrecognizable: Humor is his defining characteristic.

The phrase emphasizes that among all possible traits, this one matters most for identification or classification.

Related

hallmark · calling card · emblematic · nature · inherent · iconic · intrinsic · differentiating · stock in trade · signature · bread and butter · fundamental · quintessential · archetype · claim to fame · exclusive · essence · standout

Opposites
essentiality

defining characteristicminor detail

Insignificant specific element

nonessential · side note · footnote · afterthought

Family

define, defining, defined, defines, redefine, redefined, redefining, undefined, definite

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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G