Etymology
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birth (v.)
mid-13c., "be born," from birth (n.). Meaning "give birth to, give rise to" is from 1906. Related: Birthed; birthing.
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birth (n.)

c. 1200, "fact of being born;" mid-13c., "act of giving birth, a bringing forth by the mother, childbirth," sometimes in Middle English also "conception;" also "that which is born, offspring, child;" from a Scandinavian source such as Old Norse *byrðr (replacing cognate Old English gebyrd "birth, descent, race; offspring; nature; fate"), from Proto-Germanic *gaburthis (source also of Old Frisian berd, Old Saxon giburd, Dutch geboorte, Old High German giburt, German geburt, Gothic gabaurþs), from PIE *bhrto past participle of root *bher- (1) "to carry; to bear children" (compare bear (v.)).

Suffix -th is for "process" (as in bath, death). Meaning "condition into which a person is born, lineage, descent" is from c. 1200 (also in the Old English word). In reference to non-living things, "any coming into existence" is from 1610s. Birth control is from 1914; birth certificate is from 1842.

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active (adj.)

mid-14c., actif, active, "given to worldly activity" (opposed to contemplative or monastic), from Old French actif (12c.) and directly from Latin activus, from actus "a doing" (from PIE root *ag- "to drive, draw out or forth, move").

As "capable of acting" (opposed to passive), from late 14c. Meaning "energetic, lively" is from 1590s; that of "working, effective, in operation" (opposed to inactive) is from 1640s. The grammatical active voice is recorded from 1765; grammatical use of active, signifying performance and not endurance of an action, dates from mid-15c. (opposed to passive or reflexive).

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birth-mark (n.)
also birthmark, "congenital mark or blemish," by 1805, from birth (n.) + mark (n.1). Birth marks in 17c. could be longing marks; supposedly they showed the image of something longed for by the mother while expecting. Related: Birthmarked.
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activeness (n.)

"quality of being active, activity," c. 1600, from active + -ness.

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activity (n.)

c. 1400, "active or secular life," from Old French activité, from Medieval Latin activitatem (nominative activitas), a word in Scholastic philosophy, from Latin activus "active" (see active). The meaning "state of being active, briskness, liveliness" is recorded from 1520s; that of "capacity for acting on matter" is from 1540s. As "an educational exercise," by 1923.

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stillbirth (n.)
also still-birth, 1764, from still (adj.) + birth (n.).
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afterbirth (n.)
also after-birth, "placenta, etc., expelled from the uterus after birth," 1580s, perhaps based on older, similar Scandinavian compounds; see after + birth (n.). As "a birth after the death or last will of the father," 1875 (translating Latin agnatio in Roman law). Old English had æfterboren (adj.) "posthumous" in reference to birth.
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psychoactive (adj.)

also psycho-active, "of or pertaining to drugs that affect mental states," 1959, from psycho- + active.

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