Etymology
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subtend (v.)

1560s, from Latin subtendere "to stretch underneath," from sub "under" (see sub-) + tendere "to stretch," from PIE root *ten- "to stretch." Related: Subtended; subtending.

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Definitions of subtend

subtend (v.)
be opposite to; of angles and sides, in geometry;
Synonyms: delimit
From wordnet.princeton.edu