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complete [complete 词源字典]: complete: [14] Complete first reached English as an adjective, either via Old French complet or direct from Latin complētus. This was the past participle of complēre ‘fill up, finish’, a compound verb formed from the intensive prefix com- and plēre ‘fill’, a word related to Latin plēnus ‘full’ (whence plenary, plenitude, plenty, etc) and indeed to English full.

The verb complēre itself came into Old French as the now obsolete complir (complete as a verb is a later formation from the adjective), and was prefixed with a- to produce accomplir. From its stem accompliss- English got accomplish [14].
=> accomplish, compliment, comply, expletive, plenary, plenty[complete etymology, complete origin, 英语词源]
compleat (adj.): archaic spelling of complete (adj.).
complected (adj.): 1806, American English, "complexioned," a variant derivation from complexion, which, intentionally or not, shows the Latin root.
complement (n.): late 14c., "that which completes," from Old French compliement "accomplishment, fulfillment" (14c., Modern French complément), from Latin complementum "that which fills up or completes," from complere "fill up" (see complete (adj.)). Originally also having senses which were taken up c. 1650-1725 by compliment.
complement (v.): 1610s, "exchange courtesies," from complement (n.). Meaning "make complete" is from 1640s. Related: Complemented; complementing.
complementarity (n.): 1908, a term in physics, from complementary + -ity.
complementary (adj.): 1620s, "ceremonious," from complement + -ary. Sense "forming a complement" attested from 1829, earliest in complementary colors.
complete (adj.): late 14c., from Old French complet "full," or directly from Latin completus, past participle of complere "to fill up, complete the number of (a legion, etc.)," transferred to "to fill, to fulfill, to finish (a task)," from com-, intensive prefix (see com-), + plere "to fill" (see pleio-).
complete (v.): late 14c.; see complete (adj.). Related: Completed; completing.
completely (adv.): 1520s, from complete (adj.) + -ly (2).
completion (n.): late 14c., from Latin completionem (nominative completio), noun of action from past participle stem of complere "to fill up, complete" (see complete (adj.)).
complex (adj.): 1650s, "composed of parts," from French complexe "complicated, complex, intricate" (17c.), from Latin complexus "surrounding, encompassing," past participle of complecti "to encircle, embrace," in transferred use, "to hold fast, master, comprehend," from com- "with" (see com-) + plectere "to weave, braid, twine, entwine," from PIE *plek-to-, from root *plek- "to plait" (see ply (v.1)). The meaning "not easily analyzed" is first recorded 1715. Complex sentence is attested from 1881.
complex (n.): 1650s, "a whole comprised of parts," from complex (adj.). Psychological sense of "connected group of repressed ideas" was established by C.G. Jung, 1907.
complexion (n.): mid-14c., "bodily constitution," from Old French complexion, complession "combination of humors," hence "temperament, character, make-up," from Latin complexionem (nominative complexio) "combination" (in Late Latin, "physical constitution"), from complexus (see complex (adj.)). Meaning "appearance of the skin of the face" is first recorded mid-15c. In medieval physiology, the color of the face indicated temperament or health.
complexity (n.): 1721, "composite nature," from complex (adj.) + -ity. Meaning "intricacy" is from 1790. Meaning "a complex condition" is from 1794.
incomplete (adj.): late 14c., from Latin incompletus "incomplete," from in- "not" (see in- (1)) + completus (see complete).
incompletely (adv.): early 15c., from incomplete + -ly (2).
incompleteness (n.): 1640s; from incomplete + -ness.
incompletion (n.): 1804, noun of action from incomplete.
Oedipus complex: "(In Freudian theory) the complex of emotions aroused in a young child, typically around the age of four, by an unconscious sexual desire for the parent of the opposite sex and wish to exclude the parent of the same sex. (The term was originally applied to boys, the equivalent in girls being called the Electra complex.)", Early 20th century: by association with Oedipus.