also codename, code-name
( code names, code naming, code named)
1.
A code name is a name used for someone or something in order to keep their identity secret.
One of their informers was working under the code name Czerny...
N-COUNT : usu N n
2.
If a military or police operation is code-named something, it is given a name which only the people involved in it know.
The operation was code-named Moonlight Sonata.
...a military contingent, code-named Sparrowhawk.
VERB : usu passive , be V-ed n , V-ed