a value within a class interval, esp its midpoint or the nearest integral value, used to represent the interval for computational convenience
2. Also called: class number library science
a symbol on a book or other publication indicating its subject field, shelf position, etc
class mark in American English
noun
Statistics
the midpoint of a class interval
Word origin
[1885–90, for an earlier sense]This word is first recorded in the period 1885–90. Other words that entered Englishat around the same time include: booster, lineup, reactor, roller coaster, twofer