Englishfor English speakers
involuntary
Adjective
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If something is involuntary, then it is by accident or not intentionally done.
With a sudden involuntary motion, he broke the glass.
payment
Noun
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A payment is some money that someone is giving to someone else when they're buying something.
I sent the things they wanted, but I haven't gotten the payment for them yet.
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Payment is the act of paying.
I usually use my credit card for payment.
Late payment of fees will end the contract.