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(1) adjective: accepted, in the running now, used, or practiced by most people;
(2) noun: a running flow of water, electricity

the entire run of classes offered to a student

forerunner (one who comes before)

quick, as a glance; "running over with your eyes"

a long-running speech/discussion; talking or talk between people, conversation

a long, running hallway

to take place, to happen

occurring again and again

something that one uses to accomplish an end especially when the usual
means is not available

something used as a medium of exchange, a measure of value, or a means
of payment (= MONEY)