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

present participle of custom

simple past tense and past participle of custom

(obsolete) usually; by custom or habit

(obsolete) Quality of being customable; conformity to custom.

(obsolete) customary / (obsolete) Subject to the payment of customs; dutiable.

Created under particular specifications, specially to fit one's needs: specialized, unique, custom-made. / Own, personal, not standard or premade. / (archaic) Accustomed; usual.

(transitive, obsolete) To make familiar; to accustom. / (transitive, obsolete) To supply with customers. / (transitive, obsolete) To pay the customs of. / (intransitive, obsolete) To have a custom.