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Middle English extensioun from Old French extension from Latin extēnsiō extēnsiōn- from extēnsus past participle of extendere to extend extend
American Heritage Dictionary of the English Language, 5th Edition
From Old French extension, from Latin extensio
The unprofitable extension of the telegraphs has largely contributed to the loss.
He'd take the turnpike extension south.
She motioned for me to pick up the extension which I did.
She moved with the horse as if it were an extension of her body.
I do believe some ideals are worth fighting for and, by logical extension, worth killing for—but not many.
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