meridian
Cross references:
1. summit
me.rid.i.an \m*-'rid-e--*n\ n [ME, fr. MF meridien, fr. meridien of noon,
fr. L meridianus,] fr. meridies noon, south, irreg. fr. medius mid + dies
day - more at MID, DEITY obs 1: the hour of noon : MIDDAY 2: a great
circle of the celestial sphere passing through its poles and the zenith of
a given place 3: a high point 4a1: a great circle on the surface of the
earth passing through the poles a nd any given place 4a2: the half of such
a circle included between the poles 4b: a representation of such a circle
or half circle numbered for longitude on a map or globe - meridian aj