What is the meaning of Miler?

An athlete or a horse who specializes in running races of one mile, or a specified number of miles.

A race whose length is the specified number of miles.

a set of one thousand

a quantity of roughly one thousand

indefinite plural of mile

(non-standard since 2012) indefinite plural of mil

indefinite plural of mile

indefinite plural of mila (non-standard since 2012)

Source: wiktionary.org