the replacement of an atom or group of atoms in a compound by another atom or group.
- Substitution therapy
substitution therapy n. Replacement therapy in which a substitute substance is used.
- Substitution transfusion
substitution transfusion n. See exchange transfusion.
[suhb-sti-too-tiv, -tyoo-] /ˈsʌb stɪˌtu tɪv, -ˌtyu-/ adjective 1. serving as or capable of serving as a substitute. 2. pertaining to or involving substitution. substitutive /ˈsʌbstɪˌtjuːtɪv/ adjective 1. acting or able to act as a substitute 2. of or involving substitution
/ˌsʌbstɪtjuːˈtɪvɪtɪ/ noun 1. (logic, philosophy) the principle that expressions with the same reference can be substituted for one another without affecting the truth-value of any context in which they occur See also transparent context, opaque context