Reciprocity (noun)

1. The practice of exchanging things with others for mutual benefit, especially privileges granted by one country or organization to another.
2. The mutual exchange of privileges or benefits; mutuality.

Origin:

From latin reciprocus (moving back and forth), from re- (back) + pro- (forward) + -cus (moving), from the verb ciere (to move).

Examples:

1. The two countries signed a treaty of reciprocity on trade agreements.
2. The reciprocity of the partnership was beneficial for both companies.
3. The reciprocity agreement allows citizens of both countries to work in the other without a special visa.
4. The principle of reciprocity is often used in social interactions and relationships.
5. The reciprocity in their friendship was mutual respect and trust.