A mile is a unit of length typically used to measure distance. It is equal to 5,280 feet or 1.609 kilometers. A clue with "marker" suggests that a mile marker refers to a signpost or marker placed along a road at regular intervals to indicate the distance traveled in miles.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: One of over 140 in an Ironman triathlon. Explanations are generated by AI and may be inaccurate.