Real Dictionary

-meter in American English
a device for measuring (a specified thing)
combining form: a combining form meaning “measure,” used in the names of instruments measuring quantity, extent, degree, etc

-meter in British English
combining form in countable noun: indicating an instrument for measuring

meter
countable noun: A meter is a device that measures and records something such as the amount of gas or electricity that you have used.

meter in American English 1
rhythm in verse; measured, patterned arrangement of syllables, primarily according to stress or length
noun: the fundamental unit of length in the metric system, equivalent to 39.37 U.S. inches, originally intended to be, and being very nearly, equal to one ten-millionth of the distance from the equator to the pole measured on a meridian: defined from 1889 to 19

meter in American English 2
a person who measures; esp., an official who measures commodities
to measure or record with a meter or meters
noun: the rhythmic element as measured by division into parts of equal time value

meter in American English 3
noun: an instrument for measuring, esp. one that automatically measures and records the quantity of something, as of gas, water, miles, or time, when it is activated
transitive verb: to measure by means of a meter

meter in British English 1
noun

meter in British English 2
noun

meter in British English 3
noun: any device that measures and records the quantity of a substance, such as gas, that has passed through it during a specified period

meter in Electrical Engineering
noun: A meter is a metric unit of length equal to 100 centimeters.