1. (n.) 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.

2. (n.) 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.

3. (n.) 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.

4. (n.) A segment gear.

5. (n.) One of the cells or division formed by segmentation, as in egg cleavage or in fissiparous cell formation.

6. (n.) One of the divisions, rings, or joints into which many animal bodies are divided; a somite; a metamere; a somatome.

7. (v. i.) To divide or separate into parts in growth; to undergo segmentation, or cleavage, as in the segmentation of the ovum.

adjunct affiliation air line allotment allowance analyze anatomize apportion assay axis beeline big end bigger half bit bite body branch break down break up budget categorize chord chunk church cleave commission communion community component contingent cross section cut cut up deal denomination destiny detachment detail diagonal diameter direct line directrix dissect district divide divide up dividend division divvy divvy up dole edge element end equal share faction fate fellowship fraction fragment great-circle course group half halver helping installment interest isolate item joint length lot measure meed member mess modicum moiety normal offshoot order organization parcel parcel out part particular partition party percentage perpendicular persuasion piece portion proportion quadrant quantum quarter quota radius radius vector rake-off random sample ration reduce reduce to elements religious order remainder resolve right line sample sampling schism school secant seclude sect sectarism section sector separate set off share shortcut side slice small share society split split up stake stock straight straight course straight line straight stretch straightaway streamline subdivide subdivision subgroup subspecies tangent transversal variety vector version wedge zone