The term PART OF R.B.I. is an acronym for RUNS Batted In, which is a statistic used in baseball to measure the number of RUNS a batter has scored due to their own hitting. The crossword solutions for this term are RUNS (4 letters), RUN (3 letters), and BATTED (6 letters). RUNS refers to the total number of RUNS scored by a batter, RUN is the act of a batter running around the bases after hitting the ball, and BATTED is the action of the batter hitting the ball.