IN MATH:1. n. a standard or reference against which other things are compared. 2. 1; one. 3. the name of the first place to the left of the decimal.
See: 
See:

IN ENGLISH: 1. as defined above.
APPLICATION: See lists 10 and 100 and 110.
1. Select the units of length.
liter  foot  meter  inch  second 
hour  degree  yard  day  
dollar  kilogram  hectare  acre 
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