Etymology
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lateral (adj.)

"of or pertaining to the side," early 15c., from Old French latéral (14c.) and directly from Latin lateralis "belonging to the side," from latus (genitive lateris) "the side, flank of humans or animals, lateral surface," a word of uncertain origin. Specific sense "situated on either side of the median vertical longitudinal plane of the body" [Century Dictionary] is from 1722.

As a noun, from 1630s, "a side part;" as a type of pass to the side in U.S. football, it is attested from 1934 (short for lateral pass). Related: Laterally.

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Definitions of lateral
1
lateral (adj.)
situated at or extending to the side; "shot out sidelong boughs"- Tennyson;
the lateral branches of a tree
Synonyms: sidelong
lateral (adj.)
lying away from the median and sagittal plane of a body;
lateral lemniscus
2
lateral (n.)
a pass to a receiver upfield from the passer;
Synonyms: lateral pass
From wordnet.princeton.edu