debility n.

active word-forming element in English and in many verbs inherited from French and Latin, from Latin de "down, down from, from, off; concerning" (see de), also used as a prefix in Latin, usually meaning "down, off, away, from among, down from," but also "down to the bottom, totally" hence "completely" (intensive or completive), which is its sense in many English words.

As a Latin prefix it also had the function of undoing or reversing a verb's action, and hence it came to be used as a pure privative — "not, do the opposite of, undo" — which is its primary function as a living prefix in English, as in defrost (1895), defuse (1943), de-escalate (1964), etc. In some cases, a reduced form of dis-.

"Russian radical socialist of the revolutionary period," 1917, from Russian bol'shevik (plural bol'sheviki), from bol'shiy "greater," comparative of adjective bol'shoy "big, great" (as in Bolshoi Ballet), from Old Church Slavonic boljiji "larger," from PIE root *bel- "strong" (source also of Sanskrit balam "strength, force," Greek beltion "better," Phrygian balaios "big, fast," Old Irish odbal "strong," Welsh balch "proud;" Middle Dutch, Low German, Frisian pal "strong, firm").

The faction of the Russian Social Democratic Worker's Party after a split in 1903 that was either "larger" or "more extreme" (or both) than the Mensheviks (from Russian men'shij "less"); after they seized power in 1917, the name was applied generally in English to Russian communists, then also to anyone opposed to an existing order or social system. Bolshevism is recorded from 1917.