that involves mutual interaction between customers

A patron, a client; one who purchases or receives a product or service from a business or merchant, or intends to do so.

plural of customer

simple past tense and past participle of custom

plural of custome

Obsolete form of custom.

To build or alter according to personal preferences or specifications.

(in the plural) The duties or taxes imposed on imported or exported goods.

plural of custom

Third-person singular simple present indicative form of custom