add-on
1 of 2noun
ˈad-ˌän 
-ˌȯn
: something added on: such as
a
: a sum or amount added on
b
: something (such as an accessory or added feature) that enhances the thing it is added to
computer hardware add-ons
add-on
2 of 2adjective
1
: being or able to be added on
an add-on device
2
: able to be added to
add-on certificates of deposit
Synonyms
Noun
- accessory
- accessary
- accoutrement
- accouterment
- adapter
- adaptor
- adjunct
- appendage
- appliance
- attachment
- option
See all Synonyms & Antonyms 
Word History
First Known Use
Noun
1930, in the meaning defined above
Adjective
1955, in the meaning defined at sense 1
Legal Definition
add-on
adjective
1
: being or able to be added on
add-on no-fault benefits
2
: able to be added to
add-on certificates of deposit
add-ons
noun
as in accessories
something that is not necessary in itself but adds to the convenience or performance of the main piece of equipment a blow-dryer that comes with a couple of add-ons for people who are serious about styling their hair Synonyms & Similar Words
Relevance
- accessories
- options
- appliances
- adapters
- accoutrements
- accouterments
- attachments
- appendages
- accessaries
- adaptors
- enhancements
- additives
- equipments
- accompaniments
- adjuncts
- supplements
- furnishings
- adornments
- extras
- complements
- trims
- trappings
- fillers
- trimmings
- appurtenances
- ornaments
- luxuries
- subsidiaries
- decorations
- incidentals
- embroideries
- auxiliaries
- garnishes
- embellishments
- amenities
- nonessentials
- paraphernalia
- doodads
- frills
- bells and whistles
- habiliments
- nonnecessities
Antonyms & Near Antonyms
- necessities
- essentials
- requirements
- requisites