Definitions

1. preposition

used to indicate a time or circumstance in which something happens

“She worked whilst studying for her exam.”

2. conjunction

used to indicate that two things happen at the same time

“I was reading a book whilst my friend was watching TV.”

3. noun

a period of time during which something is happening or is in a particular state

“The concert started during the lunch break, so it was a nice break whilst eating.”

4. adverb

used to indicate a time or circumstance in which something happens

“She worked quickly whilst studying for her exam.”