extensions

Noun

extension (countable and uncountable, plural extensions)

1. The act of extending; a stretching out; enlargement in length, breadth, or time; an increase.
   • Next month the house is undergoing an extension.
2. The state of being extended.
   • For station is properly no rest, but one kind of motion, relating unto that which physicians (from Galen) do name extensive or tonical; that is, an extension of the muscles and organs of motion, maintaining the body at length, or in its proper figure.1650, Thomas Browne, Pseudodoxia Epidemica: […], 2nd edition, London: […] A[braham] Miller, for Edw[ard] Dod and Nath[aniel] Ekins, […], →OCLC
3. That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension").
4. A short exact sequence 1→H→E→G→1, or the group E therein.
5. (homological algebra) A short exact sequence 0→B→E→A→0, or the object E therein.
6. A part of a building that has been added onto the original.

See all 19 meanings of extension