/mə'rɪdɪən; mə`rɪdɪən/
n
1 imaginary circle round the earth, passing through (a given place and) the North and South Poles 子午线; 经线
*the Greenwich meridian, ie longitude 0, which passes through the North and South Poles and Greenwich, England 格林威治子午线.
2 highest point reached by the sun or other star, as viewed from a given point on the earth's surface 从地面观测太阳或其他星球到达的最高点.

n
[Date: 1300-1400; Language: Old French;Origin:Latin meridianus 'of the middle of the day', from medius 'middle' + dies 'day']
[C]
one of the imaginary lines from the North Pole to the South Pole, drawn on a map of the Earth
the meridian
technical the highest point reached by the sun or another star, when seen from a point on the Earth's surface