ɛm’si:
informal

■ noun
a master of ceremonies.
an MC at a club or party.
■ verb (emcees, emceed, emceeing) act as a master of ceremonies or MC at (an event, club, etc.).

1930s: representing the pronoun of MC.
…
Merriam-Webster Collegiate® Dictionary
1em·cee
Pronunciation: ˌem-‘sē
Function: noun
Etymology: MC
Date: circa 1933

: MASTER OF CEREMONIES
2emcee
Function: verb
Inflected Form: em·ceed ; em·cee·ing
Date: 1937

transitive verb : to act as master of ceremonies of
intransitive verb : to act as master of ceremonies