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self-

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  1. a combining form of self and variously used with the meanings “of the self” (self-analysis) and “by oneself or itself” (self-appointed); and with the meanings “to, with, toward, for, on, in oneself” (self-complacent), “inherent in oneself or itself” (self-explanatory), “independent” (self-government), and “automatic” (self-operating).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for self-

self-

combining form
  1. of oneself or itselfself-defence; self-rule
  2. by, to, in, due to, for, or from the selfself-employed; self-inflicted; self-respect
  3. automatic or automaticallyself-propelled
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for self-

word forming element indicating "oneself," also "automatic," from Old English use of self (pron.) in compounds, e.g. selfbana "suicide," selflice "self-love, pride, vanity, egotism," selfwill "free will."

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Online Etymology Dictionary, © 2010 Douglas Harper