1 a : (count) : something (such as a building or large piece of equipment) that is built for a specific purpose
a large manufacturing facility
a new sewage-treatment facility
The injured child was rushed to a medical facility. (=a hospital)
a correctional facility (=a prison)
1 b : (count) : something that makes an action, operation, or activity easier — usually plural
The resort offers a wide range of facilities for young and old alike.
1 c : facilities (plural) informal : BATHROOM
The facilities are at the end of the corridor.
2 : skill and ease in doing something
(singular)
He had a great facility for writing.
(noncount)
He had great facility with words.
She handled the crisis with facility.