(~s)
Frequency: The word is one of the 3000 most common words in English.
1.
A ~ is a broadcaster who gives a radio or television commentary on an event.
...a sports ~.
N-COUNT: usu with supp
2.
A ~ is someone who often writes or broadcasts about a particular subject.
...a political ~...
A. M. Babu is a ~ on African affairs.
N-COUNT: usu with supp