To bring (something) into practice.
To cause (someone) to be acquainted (with someone else).
To add (something) to a system, a mixture, or a container.
To make (something or someone) known by formal announcement or recommendation.
To be the first to do or achieve (something), preparing the way for others to follow.
A member of a children’s organization operated by the Communist Party, typically in the second of three stages toward becoming an member of the Party itself.
A person or other entity who is first or among the earliest in any field of inquiry, enterprise, or progress.
One who goes before, as into the wilderness, preparing the way for others to follow.
Some people will consider their national heroes to be pioneers of civilization.
A member of any of several European organizations advocating abstinence from alcohol.