English

Definition of supplement verb from the Oxford Advanced Learner's Dictionary

  

supplement

 verb
verbVerb Forms present simple I / you / we / they supplement
BrE BrE//ˈsʌplɪment//
 
; NAmE NAmE//ˈsʌplɪment//
 
he / she / it supplements
BrE BrE//ˈsʌplɪments//
 
; NAmE NAmE//ˈsʌplɪments//
 
past simple supplemented
BrE BrE//ˈsʌplɪmentɪd//
 
; NAmE NAmE//ˈsʌplɪmentɪd//
 
past participle supplemented
BrE BrE//ˈsʌplɪmentɪd//
 
; NAmE NAmE//ˈsʌplɪmentɪd//
 
-ing form supplementing
BrE BrE//ˈsʌplɪmentɪŋ//
 
; NAmE NAmE//ˈsʌplɪmentɪŋ//
 
 
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BrE BrE//ˈsʌplɪment//
 
; NAmE NAmE//ˈsʌplɪment//
 
to add something to something in order to improve it or make it more complete supplement something with something a diet supplemented with vitamin pills supplement something He supplements his income by giving private lessons.
Word Origin late Middle English: from Latin supplementum, from supplere ‘fill up, complete’, from sub- ‘from below’ + plere ‘fill’.
See the Oxford Advanced American Dictionary entry: supplement