verb

1. To have a function.

2. To carry out a function; to be in action.

Synonyms: go, operate, run, work, officiate, serve

noun

1. Action of the verb function.

2. Manner by which something functions; the workings.

adjective

1. Functional, working

2. (of a person) Mentally disabled but still able to survive in wider society.

   “Oh, he looked pretty functioning to me.”

Synonyms: useful