reciprocity
Reciprocity (noun) means the practice of exchanging things with someone for mutual benefit, so that a favour, kindness or concession is returned in kind. Example: “Friendship depends on a rough reciprocity of effort.”
How to use reciprocity
Learner’s notesIn plain EnglishDoing something for someone because they did something for you.
Formal to neutral; used in ethics, law, diplomacy and psychology.
Fill the gap
Can you complete this real example?
Friendship depends on a rough _____ of effort.
Etymology
From Latin reciprocus 'moving backwards and forwards, alternating', via reciprocitas.