That is used to bring about a result or accomplish a purpose; that serves as a means. Also: of the nature of an instrument.

Serving as a means to an end. Also: conducive, serviceable. Obsolete.

Serving as an instrument or means to an end; instrumental. Obsolete.

Subsidiary or ancillary in function, role, etc.; acting as an agent, or as an instrument or means; instrumental. Obsolete.

Of the nature of or serving as an instrument or means; = instrumental, adj. 1a. Also: of or relating to an instrument or means. rare after 17th cent.

Serving as an instrument, instrumental. Obsolete.

That is of use or service as an instrument or means; serving as a means to further an end, object, or… With to (a person, thing, process, etc.).

That ministers or serves; serving as a subordinate agent; performing helpful services; administering, officiating.