To make (something or someone) known by formal announcement or recommendation.
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 or declare (an argument, statement, or theory) unsound or erroneous; disprove.
To make invalid. Especially applied to contract law.
To render invalid; discredit.