tertile

noun

1. Either of the two points that divide an ordered distribution into three parts, each containing a third of the population.
2. Any one of the three groups so divided.

   “The first tertile results include January through April's revenues.”

   “To determine whether that’s been the case, I broke the league into tertiles at both ends of the floor and overall.”

   “When we start testosterone therapy, the goal is typically to raise testosterone levels into the range of about 450 to 600 ng/dL, which is considered the “middle tertile” for most laboratory reference ranges.”