• Finnish: pidennetty

• Finnish: laajennettu

Extension may refer to:

• Extension (kinesiology), a movement of a joint in which one part of the body is moved away from another.
• Extension (metaphysics), the property of taking up space
• Extension (semantics), the set of things to which a property applied
• Extension (mathematics); an extension of some structure is another structure which contains the original structure
• Extension (geology)
• Extension (telephone), an internal telephone line attached to a PBX or Centrex system
• Software extension, a computer program that is not useful in its own right but designed to be incorporated in another piece of software
  • System Extension, a particular type of this software on the classic Mac OS
  • Extension (Mozilla), this type of software for Firefox and other Mozilla projects
• Filename extension, a suffix to the name of a computer file applied to show its format
• Tension (physics)
• Extension (community development), the building of community capacity by outsiders, for instance, agricultural extension
• Extension (cheerleading), a stunt in which a flyer is held in the air by the bases' fully extended arms
• Extension, the classical name for the Mc1r gene.
• Extension (music), a set of notes that fit outside the standard range
• Extension, BC is a small former coal-mining village near Nanaimo, BC, Canada
• Enamel extension in dentistry
• Extension cable
• Extensive property, in physics, a property which depends on the system size or the amount of material in the system
• Extension school, a school for continuing education
• Hair extensions, strands of hair added to supplement a person's existing hair
• Eyelash extensions
• Extensions the 1979 album by The Manhattan Transfer
• Extension of universal health care.

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