• an internal section of a citrus fruit
• Market segment, the smaller subgroups comprising a market

Computing

• Memory segment, the portion of computer memory which may be addressed by a single index register
• Image segment created in computer vision
• String segment, the substring of a pattern delimited by two don't cares or one don't care and beginning or end of the pattern
• Network segment, a part of a larger computer network
• A protocol data unit of the transport layer in computing, e.g. TCP segment

Geometry

• Line segment, part of a line that is bounded by two end points
• Circular segment, the area which is "cut off" from the rest of the circle by a secant or a chord

Science

• Segment (biology), a repeated part of the metazoan body
• Segment (linguistics), a consonant or vowel
• Segment (rocketry), a controlled rocket motor burn of specified duration

See also

• Part
• Segmentation (disambiguation)
• Subdivision (disambiguation)
• Section (disambiguation)
• Division (disambiguation)