Meaning of INVERSE in English
( a. )
Opposite in nature and effect; -- said with reference to any two operations, which, when both are performed in succession upon any quantity, reproduce that quantity; as, multiplication is the inverse operation to division. The symbol of an inverse operation is the symbol of the direct operation with -1 as an index. Thus sin-1 x means the arc whose sine is x.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012