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

    

substitute

 verb
verb
BrE BrE//ˈsʌbstɪtjuːt//
 
; NAmE NAmE//ˈsʌbstɪtuːt//
 
Verb Forms present simple I / you / we / they substitute
BrE BrE//ˈsʌbstɪtjuːt//
 
; NAmE NAmE//ˈsʌbstɪtuːt//
 
he / she / it substitutes
BrE BrE//ˈsʌbstɪtjuːts//
 
; NAmE NAmE//ˈsʌbstɪtuːts//
 
past simple substituted
BrE BrE//ˈsʌbstɪtjuːtɪd//
 
; NAmE NAmE//ˈsʌbstɪtuːtɪd//
 
past participle substituted
BrE BrE//ˈsʌbstɪtjuːtɪd//
 
; NAmE NAmE//ˈsʌbstɪtuːtɪd//
 
-ing form substituting
BrE BrE//ˈsʌbstɪtjuːtɪŋ//
 
; NAmE NAmE//ˈsʌbstɪtuːtɪŋ//
 
 
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 [intransitive, transitive] to take the place of somebody/something else; to use somebody/something instead of somebody/something else substitute for somebody/something Nothing can substitute for the advice your doctor is able to give you. substitute A for B Margarine can be substituted for butter in this recipe. substitute B with/by A Butter can be substituted with margarine in this recipe. substitute somebody/something Ronaldo was substituted in the second half after a knee injury (= somebody else played instead of Ronaldo in the second half). When for, with or by are not used, as in the last example, it can be difficult to tell whether the person or thing mentioned is being used, or has been replaced by somebody or something else. The context will usually make this clear. Can you find someone to substitute for you at the meeting? Word Origin late Middle English (denoting a deputy or delegate): from Latin substitutus ‘put in place of’, past participle of substituere, based on statuere ‘set up’.
See the Oxford Advanced American Dictionary entry: substitute