adjective: (of a delivery, exchange, etc., of physical goods) Conducted without human-to-human contact to improve ease of use or reduce the potential spread of a contagious disease; contact-free.
adjective: That does not use or require contact in order to operate.
adjective: That has no contact(s).
noun: A technology for paying for goods etc. while physically present at the point of interaction but without the need for physical contact.