One of the parts into which any body naturally separates or is divided; a part divided or cut off; a section; a portion.
a segment of an orange; a segment of a compound or divided leaf
The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone,[…]. Scribes, illuminators, and scholars held such stones directly over manuscript pages as an aid in seeing what was being written, drawn, or read.2013 September-October, Henry Petroski, “The Evolution of Eyeglasses”, in American Scientist:
› A portion.
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Mathematics, Sciences A straight path between two points that is the shortest distance between them; a line segment.
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Geometry, Mathematics, Sciences The part of a circle between its circumference and a chord (usually other than the diameter).
Mathematics, Sciences, Topology Any of the pieces that constitute an order tree.
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Human sciences, Linguistics, Phonology, Sciences A discrete unit of speech: a consonant or a vowel.
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Biology, Botany, Natural sciences, Sciences A portion of an organ whose cells are derived from a single cell within the primordium from which the organ developed.
In Lejeuneaceae vegetative branches normally originate from the basiscopic basal portion of a lateral segment half, as in the Radulaceae, and the associated leaves, therefore, are quite unmodified.1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, Chicago, Ill.: Field Museum of Natural History, →ISBN, page 5:
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Biology, Natural sciences, Sciences, 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.
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Broadcasting, Media A part of a broadcast program, devoted to a topic.
The news showed a segment on global warming.
In “Treehouse Of Horror” episodes, the rules aren’t just different—they don’t even exist. If writers want Homer to kill Flanders or for a segment to end with a marriage between a woman and a giant ape, they can do so without worrying about continuity or consistency or fans griping that the gang is behaving out of character.2012 April 29, Nathan Rabin, “TV: Review: THE SIMPSONS (CLASSIC): “Treehouse of Horror III” (season 4, episode 5; originally aired 10/29/1992)”, in (Please provide the book title or journal name):
Computing, Engineering, Mathematics, Natural sciences, Physical sciences, Programming, Sciences A region of memory or a fragment of an executable file designated to contain a particular part of a program.
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Lifestyle, Tourism, Transport, Travel A portion of an itinerary: it may be a flight or train between two cities, or a car or hotel booked in a particular city.