( a. )
Exactly upright or vertical; pointing to the zenith; at right angles to the plane of the horizon; extending in a right line from any point toward the center of the earth.
( a. )
Exactly upright or vertical; pointing to the zenith; at right angles to the plane of the horizon; extending in a right line from any point toward the center of the earth.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012