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English word occasion comes from Latin occido, and later Latin occasus (Setting. Western Setting (of the sun etc.). West.)
occido (Latin)
(intransitive) I am lost, undone or ruined. (intransitive) I fall down. (intransitive) I perish, die, pass away. (intransitive, of heavenly bodies) I go down, set.
occasus (Latin)
Setting. Western Setting (of the sun etc.). West.
occasionem (Latin)
occasiun (Old French)
occasion (Middle French)
occasion (English)
(obsolete) An occurrence or incident. [14th-18th c.]. A favorable opportunity; a convenient or timely chance. [from 14th c.]. A particular happening; an instance or time when something occurred. [from 15th c.]. A reason or excuse; a motive; a persuasion.. A special event or function. [from 19th c.]. An occurrence or state of affairs which causes some event or reaction; a motive or reason. [...]