In a manner relating to barometric pressure or measurement; in a way that can be measured by a barometer.
Formed from barometric + -ally adverb suffix. This standard English pattern of creating adverbs allows any adjective to become an adverb describing how something happens or is done.
Adding '-ally' to any adjective to make an adverb is so automatic in English that we rarely notice it, but it's a powerful tool that lets us turn thousands of descriptive words into action words—watch how many adverbs you hear today that end in -ally!
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