technical
: near or toward the back of something (such as the body)
the posterior part of the brain
plural posteriors
humorous
: the part of the body above the legs that is used for sitting : buttocks
The man squeezed his large posterior into the chair.
Cite this Entry
“Posterior.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/posterior. Accessed 19 Jun. 2026.
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