extension
noun
[ ɪkˈstɛnʃ(ə)n ]
• a part that is added to something to enlarge or prolong it.
• "the railway's southern extension"
Similar:
addition,
add-on,
adjunct,
addendum,
augmentation,
supplement,
appendage,
appendix,
annexe,
wing,
supplementary building,
ell,
• a length of electric cable which permits the use of appliances at some distance from a fixed socket.
• a subsidiary telephone on the same line as the main one.
• "you can listen on the extension in the bedroom"
• the action of moving a limb from a bent to a straight position.
• "seizures with sudden rigid extension of the limbs"
• denoting instruction by a university or college arranged for people who are not full-time students.
• "a postgraduate extension course"
• the range of a term or concept as measured by the objects which it denotes or contains.
• the property of occupying space.
• "nature, for Descartes, was pure extension in space"
Origin:
late Middle English: from late Latin extensio(n- ), from extendere ‘stretch out’ (see extend).