The Oxford Thesaurus An A-Z Dictionary of Synonyms - segment n.

1) section, part, division, portion, component, element; piece, fraction, fragment, length, joint, slice, wedge: Only a narrow segment of the population supports the new measures. She divided the orange into three equal segments. --v. 2) divide, partition, section, separate, part, cleave, split, subdivide, fragment: The department was then further segmented into smaller units, each with its own manager.