This is the 2921st most frequent Russian word.
вошел
"Entered."
Here, 'вошел' is used in the past tense to indicate someone entering a location.
Он вошел в комнату, чтобы поговорить.
He entered the room to talk.
In this case, 'вошел' conveys the action of being incorporated into something, metaphorically indicating inclusion.
Материал вошел в учебный план школы.
The material was included in the school's curriculum.
Here, 'вошел' is used to describe the commencement or entry into a phase or stage of a process.