binary antonyms
Definition - Pairs of antonyms that have the all-or-nothing property that to deny one member of the pair is equivalent to affirming the other.

1. As opposed to gradable antonyms, such as young and old, which represent the opposite ends of a continuum.

Example -
True and False are binary antonyms because to deny that something is true amounts to affirming it is false (and vice versa).

Oxford English Dictionary -
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