Etymology
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deter (v.)

1570s, "discourage and stop by fear," from Latin deterrere "to frighten from, discourage from," from de "away" (see de-) + terrere "frighten, fill with fear" (see terrible). Meaning "stop or prevent from acting or proceeding by any countervailing motive" is from 1590s. Related: Deterred; deterring.

updated on August 04, 2018

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Definitions of deter from WordNet

deter (v.)
try to prevent; show opposition to;
Synonyms: discourage
deter (v.)
turn away from by persuasion;
Synonyms: dissuade
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.