|Origin:||, past participle of substituere 'to put in place of', from statuere; STATUTE|
1 also sub
someone who does someone else's job for a limited period of time, especially in a sports team or school:
Germany brought on a substitute at half time.
The coach has to find a substitute for Tim.
a person or thing that you use instead of the one that you usually have, because the usual one is not available:
a sugar substitute
a father substitute
used to emphasize that something is not as good as another thing:
Vitamin pills are no substitute for a healthy diet.