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segment (n.)

1560s, from Latin segmentum "a strip or piece cut off, a cutting, strips of colored cloth," from secare "to cut" (from PIE root *sek- "to cut"), with euphonious alteration of -c- to -g- before -m-. Latin segmentum was used in Medieval Latin as a geometry term, translating Greek tmema, and the word was first picked up in English in this sense. Meaning "segmental portion of anything circular" is from 1640s; general sense of "a division, section" is from 1762.

segment (v.)

1859, intransitive, in reference to cell division, from segment (n.). Transitive sense, "divide (something) into segments" is from 1872. Related: Segmented; segmenting.

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Definitions of segment
1
segment (v.)
divide into segments;
segment an orange
segment a compound word
Synonyms: section
segment (v.)
divide or split up;
The cells segmented
2
segment (n.)
one of several parts or pieces that fit with others to constitute a whole object;
finished the final segment of the road
Synonyms: section
segment (n.)
one of the parts into which something naturally divides;
a segment of an orange
From wordnet.princeton.edu