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Definition of segment : 1. A part cut off from a figure by a line or plane; especially, that part of a circle contained between a chord and an arc of that circle, or so much of the circle as is cut off by the chord; as, the segment acb in the Illustration.
2. A piece in the form of the sector of a circle, or part of a ring; as, the segment of a sectional fly wheel or flywheel rim.
3. A segment gear.
4. One of the cells or division formed by segmentation, as in egg cleavage or in fissiparous cell formation.
5. One of the divisions, rings, or joints into which many animal bodies are divided; a somite; a metamere; a somatome.
6. One of the parts into which any body naturally separates or is divided; a part divided or cut off; a section; a portion; as, a segment of an orange; a segment of a compound or divided leaf.
7. To divide or separate into parts in growth; to undergo segmentation, or cleavage, as in the segmentation of the ovum.

Synonyms:

flesh, pincer, particle, detail, outline, passage, diagonal, plane section, abdomen, juice, horizontal, bruising, proboscis, surgical incision, core, peel, study at part, nectar, peelings, separate, arc, dissever, instalment, hull, compound eye, antenna, leg, dextrose, diameter, incision, inclined plane, substructure, unit, break up, assemble, axis, curvature, chord, atom, mandible, department, feelers, line, pectin, discussion section, gossamer

commission, assignment, quantum, piece, percentage, allotment, division, allocation, chunk, dispensation, stake, part, lot, allowance, stipend, proportion, quota, apportionment

deal, set, allow, divide, distribute, portion, cut, apportion, partition, allocate, mete, earmark, measure, allot, split, share, parcel, slice, give, budget, assign, ration, dispense

ingredient, item, article, constituent, filament, component, fragment, feature, element, matter, factor, medium, section, material

numerator, denominator, third, quarter

compartment, dismember, helping, halve, zone, bit, dividend, stock, compartmentalize, subdivide, sector, interest, subdivision, fraction, half, member

Usage examples:

• When this is done, the Spider moves a little along a circular line and the loom works in the same manner on another segment. - "The Life of the Spider", J. Henri Fabre.
• It is impossible from so small a segment of a circle as Bruce's life describes, to infer with any certainty the whole. - "Specimens with Memoirs of the Less-known British Poets, Vol. 3", George Gilfillan.
• World trade supports a significant segment of American industry and agriculture. - "Complete State of the Union Addresses from 1790 to the Present", Various.