No. 329 in Russian
первом
"Первом" is the prepositional case of "первый," meaning "first" (used in certain contexts like "in the first" or "on the first").
In a sentence
В первую очередь, я хотел бы поблагодарить за возможность здесь выступить.
First of all, I would like to thank you for the opportunity to speak here.
The word "первую" here forms part of the idiomatic phrase "в первую очередь," meaning "first of all" or "primarily."
На первом месте для меня всегда будет семья.
Family will always come first for me.
In this sentence, "первом" is part of the phrase "на первом месте," meaning "in the first place," indicating the top priority.
Мы жили на первом этаже этого дома.
We lived on the first floor of this building.
Here, "первом" describes the ordinal position of the floor, "первом этаже," meaning "first floor."
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