past and past participle
Used an idea, fact, or source as the main support for something, or formed using it.
The movie was based on a true story.
We based our decision on the available evidence.
American English
How to pronounce based
verbB1Very common word
BEYST
/beɪst̚/
One syllable.
Form of base
Based is commonly used with on to show the main support or source and with in to show a place of operation.
Used an idea, fact, or source as the main support for something, or formed using it.
Practice out loudMeanings & examples
past and past participle
Chose a particular place as the main place where someone or something operates, or was located there.
The company is based in Austin.
They based the new office in Seattle.
Useful expressions
To contact someone briefly, usually to share information or make a plan.
I’ll touch base with Maya tomorrow.
Wrong about something; not accurate.
That estimate is way off base.
Related words & forms
Drop the final e before -ing: basing, but keep it before -ed: based.