Meaning of “closely” - Learner’s Dictionary

closely

adverb uk us /ˈkləʊsli/
CAREFULLY

If you look at or listen to something closely, you look at it or listen to it very carefully.

CONNECTED

B2 If two things are closely connected, related, etc, they are very similar to each other or there is a relationship between them:

The two languages are closely related.
Which Amercian city most closely resembles Paris?
VERY NEAR

in a way that is very near in distance or time:

Elke came into the room, closely followed by her children.
WORK

B2 If you work closely with someone, you work together a lot:

Nurses work closely with other medical staff.

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