while
She read a book while drinking tea.
The action of reading happened at the same time as drinking tea.
During the same time that something else is happening
He watched TV while eating dinner.
The two actions happened simultaneously.
Often used to contrast two actions happening at the same time.
Although, whereas (introducing a contrast)
While I enjoy reading, she prefers watching movies.
This shows a difference in preferences between the two people.
Can sometimes be replaced with 'whereas' in formal writing.
A period of time (noun)
She worked for a while before taking a break.
She worked for a short period of time before resting.
When used as a noun, it typically refers to a short, unspecified time.
Collocations
Related Phrases
Pro Tip
Conjunction vs. Noun
Remember that 'while' can be both a conjunction (introducing a clause) and a noun (referring to a period of time).
Gold Rule
Contrast or Simultaneity
When 'while' is used as a conjunction, it can indicate either simultaneous actions or a contrast between two ideas.
Word Origin
Old English 'hwīl', meaning 'a time, period, or space of time'
Usage Notes
When used as a conjunction, it can introduce a contrast or show simultaneous actions. As a noun, it refers to a short period of time.