English▸ noun [mass noun] distance travelled or measured eastward, especially at sea:
with the help of the following breeze, she ran 650 miles of her easting down.
▪ [count noun] a figure or line representing eastward distance on a map (expressed by convention as the first part of a grid reference, before northing):
the Japanese sent a message that accidentally left out an easting and a northing in the plain text.