The action of the verb to run.

The activity of running as a form of exercise, as a sport, or for any other reason.

That which runs or flows; the quantity of a liquid which flows in a certain time or during a certain operation.

The discharge from an ulcer or other sore.

(colloquial) The act of running errands.

present participle and gerund of run

An adjective "running" describes something that is moving or advancing at a run, and can also refer to a horse with a running gait rather than a trotter or pacer.

Present, current.

Flowing; easy; cursive.

Continuous; ongoing; keeping along step by step.

Having a continuous design or pattern.

(much more commonly expressed by an adverb; see below) Consecutive .

(botany) Extending by a slender climbing or trailing stem.

(medicine) Discharging pus.

(medicine, of a nose) Discharging snot or mucus.

(colloquial) Approaching; about; roughly. (Can we add an example for this sense?)

(informal) Consecutively; in a row.