Etymology
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intersect (v.)

1610s (trans.), back-formation from intersection, or else from Latin intersectus, past participle of intersecare "intersect, cut asunder," from inter "between" (see inter-) + secare "to cut" (from PIE root *sek- "to cut"). Intransitive sense is from 1847. Related: Intersected; intersecting.

intersect (n.)

"point of intersection," 1850, from intersect (v.) or from Latin intersectum, neuter past pasticiple of intersecare. Earlier (1650s) it was used for "an insect."

updated on April 29, 2017

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Definitions of intersect from WordNet

intersect (v.)
meet at a point;
Synonyms: cross
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.