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decision (n.)

mid-15c., "act of deciding," from Old French décision (14c.), from Latin decisionem (nominative decisio) "a decision, settlement, agreement," noun of action from past-participle stem of decidere "to decide, determine," literally "to cut off," from de "off" (see de-) + caedere "to cut" (from PIE root *kae-id- "to strike").

Meaning "final judgment or opinion in a case" is from 1550s. Meaning "quality of being decided in character, ability to make prompt determinations" is from 1781; sense of "a resolution, a fixing of purpose" is by 1886.  Decision-making (adjective) is recorded by 1946.

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Definitions of decision from WordNet

decision (n.)
the act of making up your mind about something;
the burden of decision was his
decision (n.)
a position or opinion or judgment reached after consideration;
a decision unfavorable to the opposition
decision (n.)
(boxing) a victory won on points when no knockout has occurred;
had little trouble in taking a unanimous decision over his opponent
decision (n.)
the outcome of a game or contest;
the team dropped three decisions in a row
decision (n.)
the trait of resoluteness as evidenced by firmness of character or purpose;
Synonyms: decisiveness
From wordnet.princeton.edu