Meaning of “welcome” - Learner’s Dictionary

welcome

adjective uk us /ˈwelkəm/

B2 If something is welcome, people are pleased about it and want it to happen:

a welcome change
Your comments are very welcome.
→ Opposite unwelcome
You're welcome.

A2 used to be polite to someone who has thanked you:

"Thank you." "You're welcome."
make sb (feel) welcome

B1 to make a visitor feel happy and comfortable in a place by being kind and friendly to them:

They made me very welcome in their home.
be welcome to do sth

B1 used to tell someone that they can certainly do something, if they want to:

Anyone who is interested is welcome to come along.
be welcome to sth

used to tell someone that they can certainly have something, if they want it, because you do not

(Definition of “welcome adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)