segment

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of the parts into which something can be divided: segments of the community; a segment of a television program.
2. n. Mathematics The portion of a line between any two points on the line.
3. n. Mathematics The area bounded by a chord and the arc of a curve subtended by the chord.
4. n. Mathematics The portion of a sphere cut off by two parallel planes.
5. n. Biology A clearly differentiated subdivision of an organism or part, such as a metamere.
6. v. To divide or become divided into segments.

Century Dictionary and Cyclopedia

1. n. A part cut off or marked as separate from others; one of the parts into which a body naturally divides itself; a section: as, the segments of a calyx; the segments of an orange; the segments of a leaf. Specifically, in zoology and anatomy:
2. n. In geometry, a part cut off from any figure by a line or plane. A segment of a circle is a part of the area contained within an arc and its chord, as ACB. The chord is sometimes called the base of the segment. An angle in a segment is the angle contained by two straight lines drawn from any point in its arc to the extremities of its chord or base.
3. n. In heraldry, a bearing representing one part only of a rounded object, as a coronet or wreath: usually a piece less than half of the circle.
4. To divide or become divided or split up into segments. In embryology, to undergo segmentation, as an ovum or vitellus. See segmentation.
5. To separate or divide into segments: as, a segmented cell.
6. n. An element of a machine, such as a toothed wheel, cam, or pulley, the active surface of which is not a full surface of revolution, but only a segment or part of such surface.

Wiktionary

1. n. A length of some object.
2. n. mathematics A straight path between two points that is the shortest distance between them.
3. n. geometry The part of a circle between its circumference and a chord (usually other than the diameter).
4. n. topology Any of the pieces that comprise an order tree.
5. n. phonology A consonant or a vowel.
6. n. broadcasting A part of a broadcast program, devoted to a topic.
7. n. computing An Ethernet bus.
8. n. travel A portion of an itinerary; can be a flight or train between two cities, a car or hotel booked in a particular city.
9. n. botany A portion of an organ whose cells are derive from a single cell within the primordium from which the organ developed.
10. n. zoology One of several parts of an organism, with similar structure, arranged in a chain; such as a vertebra, or a third of an insect's thorax.
11. v. To divide into segments or sections.

GNU Webster's 1913

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
2. n. (Geom.) 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 sector of a circle, or part of a ring.
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. (Biol.) To divide or separate into parts in growth; to undergo segmentation, or cleavage, as in the segmentation of the ovum.

WordNet 3.0

1. v. divide or split up
2. v. divide into segments
3. n. one of the parts into which something naturally divides
4. n. one of several parts or pieces that fit with others to constitute a whole object