"faulty action, blunder," 1904, from Modern Latin, from para-, here meaning "contrary" (see para- (1)) + Greek praxis "a doing, transaction, business" (see praxis). In psychology, a minor error held to reveal a subconscious motive.
before vowels, par-, word-forming element, originally in Greek-derived words, meaning "alongside, beyond; altered; contrary; irregular, abnormal," from Greek para- from para (prep.) "beside, near; issuing from; against, contrary to," from PIE *prea, from root *per- (1) "forward," hence "toward, near; against." Cognate with Old English for- "off, away." Mostly used in scientific and technical words; not usually regarded as a naturalized formative element in English.
1580s, "practice or discipline for a specific purpose," from Medieval Latin praxis "practice, exercise, action" (mid-13c., opposite of theory), from Greek praxis "practice, action, doing," from stem of prassein, prattein "to do, to act" (see practical). From 1610s as "a collection of examples for practice." In 20c. given a particular sense in Marxist jargon.
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Harper, D. (n.d.). Etymology of parapraxis. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/parapraxis