The definition of a substitution is a replacement.
An example of a substitution is a teacher filling in for an absent teacher.
the substituting of one person or thing for another
- a. The act or an instance of substituting.b. The state of being substituted.
- One that is substituted; a replacement.
- sub′sti·tu′tion·al, sub′sti·tu′tion·ar′y
substitution - Legal Definition
The selection of an individual or a thing to take the place of another; the process of one thing taking another’s place or one person acting in lieu of another.