operating

adj

1. (not-comparable)In operation; that operates.

   “Don't touch the operating machinery.”

2. (not-comparable)Involved in an operation.

   “The team arbitrarily chose that one operating frame of reference which we all use today.”

verb

1. (form-of, gerund, participle, present)present participle and gerund of operate

noun

1. (uncountable)Synonym of operation (in the uncountable sense).

   “Sure, academic medicine is fascinating — but operating is the reason I became a surgeon.”

   “Operating on conscious patients involves some additional considerations.”