air pressure

noun

: pressure exerted by air:

a

: atmospheric pressure

b

: the pressure within a container due to the compression of atmospheric gases

Air pressure in the car tire was measured in pounds per square inch.

Word History

First Known Use

1837, in the meaning defined above

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!