A surname.

plural of Kaplan

(hydroelectricity) A water turbine that has adjustable blades so that a constant rate of revolution is achieved.

plural of Kaplan turbine

Of or relating to Mordecai Kaplan (born Mottel Kaplan; 1881–1983), Lithuanian-born American rabbi, writer, Jewish educator, professor, theologian, philosopher, activist, and religious leader who founded the Reconstructionist branch of Judaism along with his son-in-law Ira Eisenstein.