Etymology
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variable (n.)

"quantity that can vary in value," 1816, from variable (adj.) in mathematical sense of "quantitatively indeterminate" (1710). Related: Variably; variability.

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interwork (v.)

c. 1600, a hybrid from inter- "between" + work (v.). Related: interworking. Past tense can be either interworked or interwrought.

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mouthful (n.)

early 15c., "as much as a mouth can hold," from mouth (n.) + -ful. Meaning "a lot to say" is from 1748.

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lubricant (n.)

"material that can reduce friction in rubbing surfaces," 1828, probably from lubricant (adj.), or else from Latin lubricantem.

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*magh- 

Proto-Indo-European root meaning "to be able, have power." It forms all or part of: dismay; deus ex machina; may (v.1) "am able;" might (n.) "bodily strength, power;" main; machine; mechanic; mechanism; mechano-; mage; magi; magic.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit mahan "great;" Greek mēkhanē "device, means," mekhos, makhos "means, instrument;" Old Church Slavonic mošti, Russian moč' "can, be able;" Old English mæg "I can," Gothic mag "can, is able," Old High German magan, Old Norse magn "power, might."

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hull (v.)

"to remove the husk of," early 15c., from hull (n.1). Related: Hulled, which can mean both "having a particular kind of hull" and "stripped of the hull."

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interpretable (adj.)

1610s, from Late Latin interpretabilis "that can be explained or translated," from Latin interpretari "explain, expound, understand" (see interpret).

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fallible (adj.)

early 15c., from Medieval Latin fallibilis "liable to err, deceitful," literally "that can be deceived," from Latin fallere "deceive" (see fail (v.)).

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portable (adj.)

"capable of being carried from place to place," early 15c., from French portable "that can be carried," from Late Latin portabilis "that can be carried," from Latin portare "to carry" (from PIE root *per- (2) "to lead, pass over"). An earlier word for "designed to be carried from place to place" was portatif (late 14c.), from Old French. Related: Portability.

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incalculable (adj.)

"incapable of being reckoned," 1772, from in- (1) "not, opposite of" + calculable "that can be counted" (see calculate). Related: Incalculably; incalculability.

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