c. 1600, Latin, literally "from the beginning," from ab "from" (see ab-) + ablative of initium "entrance, beginning," which is from or related to the verb inire "to go into, enter upon, begin" (see initial).
word-forming element meaning "away, from, from off, down," denoting disjunction, separation, departure; from Latin ab (prep.) "off, away from" in reference to space or distance, also of time, from PIE root *apo- "off, away" (also the source of Greek apo "off, away from, from," Sanskrit apa "away from," Gothic af, English of, off; see apo-).
The Latin word also denoted "agency by; source, origin; relation to, in consequence of." Since classical times usually reduced to a- before -m-, -p-, or -v-; typically abs- before -c-, -q-, or -t-.
1520s, "of or pertaining to a beginning," from French initial or directly from Latin initialis "initial, incipient, of the beginning," from initium "a beginning, a commencement; an entrance, a going in," noun use of neuter past participle of inire "to go into, enter upon, begin," from in- "into, in" (from PIE root *en "in") + ire "to go" (from PIE root *ei- "to go"). Related: Initially.
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Harper, D. (n.d.). Etymology of ab initio. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/ab initio
Harper Douglas, “Etymology of ab initio,” Online Etymology Dictionary, accessed $(datetime), https://www.etymonline.com/word/ab initio.
Harper, Douglas. “Etymology of ab initio.” Online Etymology Dictionary, https://www.etymonline.com/word/ab initio. Accessed $(datetimeMla).
D. Harper. “Etymology of ab initio.” Online Etymology Dictionary. https://www.etymonline.com/word/ab initio (accessed $(datetime)).
updated on September 25, 2016
Definitions of ab initio from WordNet
ab initio (adv.)
at the beginning;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.