Etymology
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depend (v.)

mid-15c., "to be attached to as a condition or cause, be a conditional effect or result," a figurative use, also literal, "to hang, be sustained by being attached to something above;" from Old French dependre, literally "to hang from, hang down," and directly from Latin dependere "to hang from, hang down; be dependent on, be derived," from de "from, down" (see de-) + pendere "to hang, cause to hang; weigh" (from PIE root *(s)pen- "to draw, stretch, spin").

From c. 1500 as "to rely, rest in full confidence or belief;" from 1540s as "be sustained by, be dependent (on)." Related: Depended; depending.

updated on July 25, 2018

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Definitions of depend from WordNet

depend (v.)
be contingent upon (something that is elided);
That depends
depend (v.)
have faith or confidence in;
Synonyms: count / bet / swear / rely / bank / look / calculate / reckon
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.