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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
operation code
op code
(Always "op code" when spoken) The part or parts
of a machine language instruction which determines what
kind of action the computer should take, e.g. add, jump, load,
store. In any particular instruction set certain fixed bit
positions within the instruction word contain the op code,
others give parameters such as the addresses or registers
involved. For example, in a 32-bit instruction the most
significant eight bits might be the op code giving 256
possible operations.
For some instruction sets, certain values in the fixed bit
positions may select a group of operations and the exact
operation may depend on other bits within instruction word or
subsequent words.
When programming in assembly language, the op code is
represented by a readable name called an {instruction
mnemonic}.
(1997-02-14)