This is the 9502nd most frequent Russian word.
утренние
"Morning" or "related to the morning."
Here, 'утренние' is an adjective describing 'часы' (hours), specifying that they are in the morning.
Утренние часы особенно тишины и спокойствия.
Morning hours are especially full of silence and tranquility.
In this sentence, 'утренние' modifies 'прогулки' (walks), expressing the time of day during which the walks occur.
Я люблю утренние прогулки в парке.
I love morning walks in the park.
'Утренние' is used as an adjective for 'газеты' (newspapers), indicating that these newspapers are issued in the morning.