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 starts with post, similar to post in after, which can help you remember it refers to future generations.
Prosperity contains the word prosper, which is associated with wealth and success.
Think of posterity as similar to poster, which is something future generations might see on a wall.
Prosperity is often a term used in economics to discuss a prosperous financial state.
Remember that posterity is more akin to legacy, while prosperity is akin to affluence.