This is the 3652nd most frequent Arabic word.
الأثناء
"The moments" or "the times."
In this sentence, "الأثناء" is used in the phrase "أثناء هطول المطر" (during the rainfall) to indicate the time period in which the studying was happening.
كنت أدرس أثناء هطول المطر.
I was studying during the rainfall.
Here, "الأثناء" is part of the phrase "أثناء الإجازة الصيفية" (during the summer vacation) to describe the timeframe of enjoyment.
استمتعت أثناء الإجازة الصيفية.
I enjoyed myself during the summer vacation.
In this instance, "الأثناء" appears in "أثناء العشاء" (during dinner) to denote the time when the discussion occurred.