types:

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sq in, square inch

a unit of area equal to one inch by one inch square

sq ft, square foot

a unit of area equal to one foot by one foot square

sq yd, square yard

a unit of area equal to one yard by one yard square

centare, square meter, square metre

a centare is 1/100th of an are

square mile

an area of 640 acres

quarter section

a land unit equal to a quarter of a section (160 acres) and measuring 1/2 mile on a side

acre

a unit of area (4840 square yards) used in English-speaking countries

ar, are

a unit of surface area equal to 100 square meters

hectare

(abbreviated `ha') a unit of surface area equal to 100 ares (or 10,000 square meters)

arpent

a former French unit of area; equal approximately to an acre

b, barn

(physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter

dessiatine

a former Russian unit of area equal to 2.7 acres

morgen

a South African unit of measure equal to about 2 acres

perch, pole, rod

a square rod of land

em, em quad, mutton quad

a quad with a square body

agate line, line

space for one line of print (one column wide and 1/14 inch deep) used to measure advertising

column inch, inch

a unit of measurement for advertising space

section

a land unit equal to 1 square mile

type of:

unit, unit of measurement

any division of quantity accepted as a standard of measurement or exchange