line of longitude

Noun line of longitude has 1 sense

• line of longitude(n = noun.location) meridian - an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator; "all points on the same meridian have the same longitude"
is a kind of great circle
has particulars: observer's meridian, prime meridian, magnetic meridian, date line, dateline, international date line