Englishfor English speakers
reciprocity
Noun
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Reciprocity is a relationship in which a something is given, and something is expected back in return.
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Reciprocity is a relationship which means quid pro quo or "fair trade".
You scratch my back, and I'll scratch your back: that's reciprocity.
constant
Adjective
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If something is constant, it doesn't change over time.
I have this constant pain in my back. I wish it would stop.
The rain has been constant all morning.
constant
Noun
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A constant is a value that doesn't change.
In the formula math7x^2+3y+5=z/math, 5 is a constant.