olemus
kontekstist sõltuv olemi asendamine teisega,
näiteks matemaatikas, keemias, lingvistikas

Wiktionary:
1. the act of substituting or the state of being substituted.
In this football tournament, three substitutions can be made during the match
3. (chemistry, especially organic chemistry) the replacement of an atom, or group of atoms, in a compound, with another

näiteid
https://en.wikipedia.org/wiki/Substitution_(algebra)
https://en.wikipedia.org/wiki/Substitution_(logic)
https://en.wikipedia.org/wiki/String_operations#String_substitution
https://en.wikipedia.org/wiki/Substitution_cipher
https://en.wikipedia.org/wiki/Substitute_good
https://en.wikipedia.org/wiki/Substitution_reaction

vt ka
- asendustegevus
- asendusšiffer