To cause (someone) to be acquainted (with someone else).
To add (something) to a system, a mixture, or a container.
To bring (something) into practice.
To make (something or someone) known by formal announcement or recommendation.
To make (someone) increasingly aware of, in a concerned or sensitive way.
To render capable of being acted on by actinic rays of light.
To make (someone or something) sensitive or responsive to certain stimuli.