No. 2,100 in Russian
первая
"Первая" means "first" (feminine form) in English.
In a sentence
Это первая книга, которую я прочитал.
This is the first book that I read.
In this sentence, 'первая' modifies the noun 'книга' and signifies its ordinal position as the first in a series.
На первой остановке мы вышли из автобуса.
At the first stop, we got off the bus.
Here, 'первой' is in the prepositional case and describes 'остановке', indicating the location referring to the initial stop.
Она первая пришла на встречу.
She was the first to arrive at the meeting.
In this sentence, 'первая' is used as a predicate adjective agreeing with the subject 'она', specifying ordinal position in the context of arrival.
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