adj
supplementary
adj
1
Added to provide something extra that was needed.
"Students received supplementary notes before the exam."
"The government issued supplementary guidance on the new rules."
How to Use Supplementary
Learner’s notesIn plain EnglishAdditional, added to complete or reinforce the main thing.
Common mistake
Very close in meaning to "supplemental" — supplementary is more common in British English and formal contexts.
Easily confused with
Common pairings
supplementary material
supplementary information
supplementary angle
Word Forms
more supplementary comparative, supplementaries plural, most supplementary superlative
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Fill the Gap
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Students received _____ notes before the exam.
Etymology
From supplement + -ary; compare French supplémentaire.