Etymology
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motionless (adj.)

"without motion, being at rest," 1590s, from motion (n.) + -less. Related: Motionlessly; motionlessness.

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aerie (n.)
"eagle's nest," 1580s (attested in Anglo-Latin from early 13c.), from Old French aire "nest," Medieval Latin area "nest of a bird of prey" (12c.), perhaps from Latin area "level ground, garden bed" [Littré], though some doubt this [Klein]. Another theory connects it to atrium. Formerly spelled eyrie (1660s) on the mistaken assumption that it derived from Middle English ey "egg."
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biodiversity (n.)
also bio-diversity, "the range of variety in the living organisms of a given area," by 1988, from bio- + diversity.
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Ithaca 
western Greek Island, legendary home of Odysseus; the first element is perhaps Phoenician i "island;" the rest is unknown. Related: Ithacan.
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backstage (n.)

also back-stage, "the area of a theater out of view of the audience," especially in the wings or dressing rooms, 1891; see back (adj.) + stage (n.).

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easeful (adj.)

"attended by or affording ease; promoting rest or comfort; quiet, peaceful, restful," late 14c., from ease (n.) + -ful.

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transpontine (adj.)
1844, in a London context in reference to the area south of the Thames, from Latin trans "across, beyond" (see trans-) + pontine, from stem of pons "bridge" (see pons).
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annulus (n.)
1560s in medical use, "ring-like area or space," from a Medieval Latin misspelling of Latin anulus "little ring, finger ring," a diminutive of anus "ring" (see anus).
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minefield (n.)

"area of land planted with explosive mines," 1877, from mine (n.2) + field (n.). Figurative meaning, "subject or situation fraught with unseen dangers," is by 1947.

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lie-down (n.)
period of rest reclining, 1840, from the verbal phrase (attested from c. 1200); see lie (v.2) + down (adv.).
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