This is the 469th most frequent Russian word.
утром
In the morning.
In this context, 'утром' specifies the time of day when the action happens, implying it is morning.
Утром солнце встает рано.
In the morning, the sun rises early.
Here, 'утром' functions as an adverbial expression denoting the specific part of the day during which the activity takes place.
Я люблю гулять утром по парку.
I enjoy walking in the park in the morning.
In this sentence, 'утром' is used in combination with 'завтра' (tomorrow) to indicate the time in the near future when the meeting will occur.