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Origin and history of collateral

collateral(adj.)

late 14c., "accompanying, attendant" (especially as an auxiliary), also "descended from the same stock but in a different line" (distinguished from lineal), from Old French collateral (13c.), from Medieval Latin collateralis "accompanying," literally "side by side," from assimilated form of Latin com "with, together" (see com-) + lateralis "of the side," from latus "the side, flank of humans or animals, lateral surface," a word of uncertain origin.

Literal sense of "parallel, along the side of" attested in English from mid-15c. Related: Collaterally. Collateral damage is by 1873 in legal cases; in modern use, a euphemism for "the coincidental killing of civilians," an extended sense from c. 1968, American English, at first generally with reference to nuclear weapons. 

collateral(n.)

"colleague, associate," 1510s, from collateral (adj.). Meaning "something of value given as security" is from 1832, American English, from phrase collateral security "property, etc., given to secure the performance of a contract" (1720), in which collateral (adj.) has the sense of "aiding or confirming in a secondary way."

Entries linking to collateral

word-forming element usually meaning "with, together," from Latin com, archaic form of classical Latin cum "together, together with, in combination," from PIE *kom- "beside, near, by, with" (compare Old English ge-, German ge-). The prefix in Latin sometimes was used as an intensive.

Before vowels and aspirates, it is reduced to co-; before -g-, it is assimilated to cog- or con-; before -l-, assimilated to col-; before -r-, assimilated to cor-; before -c-, -d-, -j-, -n-, -q-, -s-, -t-, and -v-, it is assimilated to con-, which was so frequent that it often was used as the normal form.

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