She created the sculpture for all posterity to admire.His discoveries were documented for posterity's benefit.We must preserve the artifacts for future posterity.
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Prosperity
/prɒˈsperəti/
A state of being successful, usually by making a lot of money.
Examples:
"You are sick of prosperity and indulgence."I sick of prosperity and indulgence!The son's prosperity had redounded to the credit of the father.
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Ways to tell them apart:
Posterity and prosperity both sound similar but have very different meanings.
Remember that posterity relates to people (future generations) while prosperity is about wealth or success.
To distinguish them, think of posterity as descending from poster because it involves generations, like a movie poster can refer to generational entertainment.
Prosperity has pros in it, hinting at positive outcomes and success in endeavors.
Another way to remember: 'Prosperity is about success; posterity is about descendants.