Etymology
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hawkish (adj.)
"hawk-like," by 1703, from hawk (n.) + -ish. Sense of "militaristic" is from 1965, from hawk in the transferred sense.
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peripatetic (adj.)
1560s in the philosophical sense, 1640s in the literal sense; see peripatetic (n.).
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ken (n.1)
1550s, "cognizance, intellectual view;" 1580s in a physical sense, "range of sight;" from ken (v.), in the second sense perhaps via kenning (n.2) in the same sense in nautical use; both from PIE root *gno- "to know."
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conservationist (n.)

"advocate of conservation," 1861, from conservation + -ist. The ecological sense is from 1903. Conservatist (1849) was used in the sense "conservative."

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filibuster (v.)
1853 in the freebooting sense, from filibuster (n.). Legislative sense is from 1861. Related: Filibustered; filibustering.
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environmentalism (n.)
1923, as a psychological theory (in the nature vs. nurture debate), from environmental + -ism. The ecological sense is from 1972. Related: Environmentalist (n.), 1916 in the psychological sense, 1970 in the ecological sense.
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flamer (n.)
1590s, agent noun from flame (v.). Figurative sense "glaringly conspicuous person" is from 1809. For homosexual slang sense, see flaming.
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superwoman (n.)
1906, as female equivalent of superman in the Nietzschean sense. From 1976 in the sense of "one who successfully combines career and motherhood."
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substation (n.)
also sub-station, 1864 in the policing sense, from sub- + station (n.). Power grid sense is attested from 1889.
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disengage (v.)

c. 1600 in figurative sense "loosen from that which entangles;" 1660s in literal sense of "detach, release from connection," from dis- "do the opposite of" + engage (q.v.). Intransitive sense of "withdraw, become separated" is from 1640s. Related: Disengaged; disengaging.

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