Other Uses
- The building of community capacity by outsiders, for instance agricultural extension
- Extension (geology), relating to the pulling apart of the Earth's crust and lithosphere
- Extension (kinesiology), movement of a joint whereby one part of the body is moved away from another
- Extension (metaphysics), the property of taking up space
- Extension (predicate logic), the set of tuples of values that satisfy the predicate
- Extension (semantics), the set of things to which a property is applied
- Extensional definition, a definition that enumerates every individual a term applies to
- Extension (telephone), telephone line attached to a main line or to a PBX or Centrex system
- Extension cord, power cable with a plug on one end and one or more sockets on the other end
- Extension locus, the gene locus of Melanocortin 1 receptor
- Continuing education, or extension school, a school for continuing education
- Extension, British Columbia, village near Regional District of Nanaimo, British Columbia, Canada
- Extension, Louisiana
- Eyelash extensions, material applied to eyelashes
- Hair extensions, strands of hair added to existing hair
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