This is the 13400th most frequent Russian word.
назначать
To appoint, assign, or designate.
In this sentence, "назначать" is used in the sense of scheduling a time for an event.
Я назначаю встречу на утро.
I schedule the meeting for the morning.
Here, "назначать" means to assign someone to a role or position.
Его назначают главным инженером.
He is appointed as the chief engineer.
In this case, "назначать" is used in the context of directing or prescribing something officially.