add-on

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈædɒn/US:USA pronunciation: respellingUSA pronunciation: respelling(ad′on′, -ôn′)


WordReference Random House Learner's Dictionary of American English © 2026
ˈadd-ˌon,  n. [countable]
  1. anything added on:Air-conditioning was an add-on to the price of the car.

WordReference Random House Unabridged Dictionary of American English © 2026
add-on  (ad′on′, -ôn′),USA pronunciation n. 
  1. a device or unit added to equipment or a construction:an add-on to a computer; a nice add-on to an old house.
  2. Businessan extra charge:Add-ons for taxes and tour guide fees boosted the price of the vacation to $2,500.
  3. an additional item, as a rider or provision:This is just another legislative add-on.
  4. anything added on:a hi-fi system that can be augmented with add-ons like extra speakers.

adj. 
  1. being installed or provided as an add-on:an add-on speaker system.
  • noun, nominal and adjective, adjectival use of verb, verbal phrase add on 1945–50

Collins Concise English Dictionary © HarperCollins Publishers::
add-on n
  1. a feature that can be added to a standard model or package to give increased benefits
'add-on' also found in these entries (note: many are not synonyms or translations):
affix

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