(parentheses)
1.
Parentheses are a pair of curved marks that you put around words or numbers to indicate that they are additional, separate, or less important. (This sentence is in parentheses.)
= bracket
N-COUNT: usu pl
2.
A ~ is a remark that is made in the middle of a piece of speech or writing, and which gives a little more information about the subject being discussed.
N-COUNT
3.
You say ‘in ~’ to indicate that you are about to add something before going back to the main topic.
PHRASE: PHR cl