A unit of linear measure equal to 1,760 yards (approximately 1.609 kilometres); originally, a Roman measure of 1,000 paces (approximately 1,620 yards).
Recorded from Old English (in the form mīl) the word is based on Latin mil(l)ia, plural of mille ‘thousand’; the original Roman unit of distance was mille passus ‘a thousand paces’.
be miles away be lost in thought and unaware of what is happening around one.
the mile-high club used humorously in reference to having sex on an aircraft.
See also after dinner rest a while, after supper walk a mile, go the extra mile, a miss is as good as a mile, Square Mile at square.