 Types:
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long measure
a measure of length

astronomy unit
a linear unit used for astronomical distances

metric linear unit
a linear unit of distance in metric terms

nautical linear unit
a linear unit of distance used in navigation

in, inch
a unit of length equal to one twelfth of a foot

foot, ft
a linear unit of length equal to 12 inches or a third of a yard

footer
(used only in combinations) the height or length of something in feet

pace, yard
a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride

yarder
(used only in combinations) the height or length of something in yards

perch, pole, rod
a linear measure of 16.5 feet

furlong
a unit of length equal to 220 yards

international mile, land mile, mi, mile, stat mi, statute mile
a unit of length equal to 1,760 yards or 5,280 feet; exactly 1609.344 meters

miler
(used only in combinations) the length of something in miles

880 yards, half mile
a unit of length equal to half of 1 mile

440 yards, quarter mile
a unit of length equal to a quarter of 1 mile

league
an obsolete unit of distance of variable length (usually 3 miles)

ligne
a linear unit (1/40 inch) used to measure diameter of buttons

nail
a former unit of length for cloth equal to 1/16 of a yard

archine
a Russian unit of length (71 cm)

coss, kos
(in India) a unit of length having different values in different localities

vara
a Spanish unit of length (about a yard) having different values in different localities

verst
a Russian unit of length (1.067 km)

cable, cable length, cable's length
a nautical unit of depth

chain
a unit of length

cubit
an ancient unit of length based on the length of the forearm

digit, finger, finger's breadth, fingerbreadth
the length of breadth of a finger used as a linear measure

fistmele
about seven inches; the breadth of a fist with the thumb stuck out (used especially in archery to give the correct distance of the string from the bow)

body length
the length of your body

handbreadth, handsbreadth
any unit of length based on the breadth of the human hand

head
the length or height based on the size of a human or animal head

lea
a unit of length of thread or yarn

li
Chinese distance measure; approximately 0.5 kilometers

link
a unit of length equal to 1/100 of a chain

mesh
the number of openings per linear inch of a screen; measures size of particles

mil
a unit of length equal to one thousandth of an inch; used to specify thickness (e.g., of sheets or wire)

Swedish mile, mil, mile
a Swedish unit of length equivalent to 10 km

Roman mile, mile
an ancient Roman unit of length equivalent to 1620 yards

Roman pace
an ancient Roman unit of length (4.85 English feet) measured as the distance from the heel of one foot to the heel of the same foot when next it touches the ground

geometric pace
a modern version of the Roman pace now taken to be 5 feet

military pace
the length of a single step in marching (taken to be 30 inches for quick time or 36 inches for double time)

palm
a linear unit based on the length or width of the human hand

span
a unit of length based on the width of the expanded human hand (usually taken as 9 inches)

survey mile
a U.S. unit of measure equal to 1609.347 meters; derived from the use of 39.37 inches as the conversion for one meter

fathom, fthm
a linear unit of measurement (equal to 6 feet) for water depth

point
a linear unit used to measure the size of type; approximately 1/72 inch

em, pica, pica em
a linear unit (1/6 inch) used in printing

en, nut
half the width of an em

cicero
a linear unit of the size of type slightly larger than an em

Gunter's chain
a unit of length (22 yards)

engineer's chain
a unit of length (100 ft)

hand
a unit of length equal to 4 inches; used in measuring horses

light year, lightyear
the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers

light hour
the distance light travels in a vacuum in one hour; approximately one billion kilometers

light minute
the distance light travels in a vacuum in one minute; approximately 18 million kilometers

light second
the distance light travels in a vacuum in one second; approximately 300,000 kilometers

AU, Astronomical Unit
a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)

parsec, secpar
a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years

femtometer, femtometre, fermi
a metric unit of length equal to one quadrillionth of a meter

micromicron, picometer, picometre
a metric unit of length equal to one trillionth of a meter

A, angstrom, angstrom unit
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

micromillimeter, micromillimetre, millimicron, nanometer, nanometre, nm
a metric unit of length equal to one billionth of a meter

micrometer, micron
a metric unit of length equal to one millionth of a meter

millimeter, millimetre, mm
a metric unit of length equal to one thousandth of a meter

centimeter, centimetre, cm
a metric unit of length equal to one hundredth of a meter

decimeter, decimetre, dm
a metric unit of length equal to one tenth of a meter

m, meter, metre
the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)

dam, decameter, decametre, dekameter, dekametre, dkm
a metric unit of length equal to ten meters

hectometer, hectometre, hm
a metric unit of length equal to 100 meters

kilometer, kilometre, klick, km
a metric unit of length equal to 1000 meters (or 0.621371 miles)

mym, myriameter, myriametre
a metric unit of length equal to 10,000 meters

nautical chain
a nautical unit of length (15 ft)

air mile, international nautical mile, knot, mi, mile, naut mi, nautical mile
a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude

Admiralty mile, geographical mile, mi, mile, naut mi, nautical mile
a former British unit of length equivalent to 6,080 feet (1,853.184 meters); 800 feet longer than a statute mile

mile, sea mile
a former British unit of length once used in navigation; equivalent to 6,000 feet (1828.8 meters)