This is the 5175th most frequent Polish word.
przyjścia
"Przyjścia" means "arrival" in English.
In this sentence, "przyjścia" is the genitive singular form of "przyjście," meaning "arrival," and is governed by the verb "oczekuję."
Oczekuję jego przyjścia z niecierpliwością.
I await his arrival eagerly.
Here, "przyjścia" is used in the genitive singular to indicate the act of arriving, as part of the phrase "moment przyjścia," meaning "moment of arrival."
Moment przyjścia na świat nowego członka rodziny był wzruszający.
The moment of the arrival of a new family member was moving.
In this instance, "przyjścia" again appears as the genitive singular form of "przyjście," indicating the event of arriving.