Meaning of SUBSTITUTION in English
( n. )
The act of substituting or putting one person or thing in the place of another; as, the substitution of an agent, attorney, or representative to act for one in his absense; the substitution of bank notes for gold and silver as a circulating medium.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012