English
machine-hour
Compound of machine + hour, although, as with any such unit of measure (e.g., ton-miles, newton metres), the mathematical relationship of multiplication is simultaneously involved: X machines working during Y hours = X × Y = Z machine-hours.
The story
Compound of machine + hour, although, as with any such unit of measure (e.g., ton-miles, newton metres), the mathematical relationship of multiplication is simultaneously involved: X machines working during Y hours = X × Y = Z machine-hours.
Today it means
noun The amount of work that can be done by one machine in one hour; a billable hour for one machine. (Said of, for example, a piece of heavy equipment or a machine tool.)
Language periods are conventional ranges, not dates for this word.
Etymograph / machine-hour