Synonyms of supplementary in English:

supplementary


See US English definition of supplementary

See UK English definition of supplementary

See Spanish definition of suplementario

adjective

1‘many MPs feel the need to seek supplementary income’

SYNONYMS
additional, extra, supplemental, increased, further, more
add-on, complementary, subsidiary, accessory, auxiliary, ancillary, supportive, reserve

2‘a supplementary index’

SYNONYMS
appended, attached, added, extra, accompanying, annexed, adjunct