Definition of tenor for English Language Learners. : 1  the highest adult male singing voice; also : a singer who has such a voice. : 2  the general or basic quality or meaning of something.
A bullpen is an area of a baseball field that allows pitchers to warm up before entering a game. The bullpen is usually set to the side at one end of the team's dugout, but there is no rule for where it has to be. The bullpen often receives a lot of attention, especially toward the end of a game, as other pitchers may be called in to relieve the starter.
Since catchers on the team roster are either on the field or in the dugout, ready to come into the game if needed, the clubs need catchers to help out in the bullpen. For bullpen catchers, there may be other tasks: throwing batting practice, for example, to warm up the hitters, or chasing fly balls and grounders before the start of the game.