extreme (adj.)

early 15c., "outermost, farthest;" also "utter, total, in greatest degree" (opposed to moderate), from Old French extreme (13c.), from Latin extremus "outermost, utmost, farthest, last; the last part; extremity, boundary; highest or greatest degree," superlative of exterus (see exterior). In English as in Latin, not always felt as a superlative, hence more extreme, most extreme (which were condemned by Johnson). Extreme unction preserves the otherwise extinct sense of "last, latest" (15c.).

extreme (n.)

1540s, "utmost point of a thing," from extreme (adj.); originally of the end of life (compare Latin in extremis in reference to the "last stages of life"). Phrase in the extreme "in an extreme degree" attested from c. 1600. Hence extremes "extremities, opposite ends of anything" (1550s); also "extreme measures" (1709).

Definitions of extreme
extreme (adj.)
of the greatest possible degree or extent or intensity;
extreme caution
extreme pleasure
extreme cold
Synonyms: utmost / uttermost
extreme (adj.)
far beyond a norm in quantity or amount or degree; to an utmost degree;
extreme temperatures
an extreme example
extreme danger
extreme (adj.)
beyond a norm in views or actions;
extreme opinions
extreme views on integration
an extreme liberal
an extreme conservative
extreme (adj.)
most distant in any direction;
the extreme edge of town
extreme (n.)
the furthest or highest degree of something;
he carried it to extremes
extreme (n.)
the point located farthest from the middle of something;
Synonyms: extreme point / extremum