prime meridian

Definition of Prime Meridian in English :

1. prime meridian

meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)

WordNet Lexical Database for English. Princeton University. 2010.

Prime Meridian

noun

the 0° meridian from which the other meridians or lines of longitude are calculated, usually taken to pass through Greenwich

the meridian from which longitude is measured both east and west; 0° longitude: it passes through Greenwich, England

n.

1. A meridian used as a reference line from which longitude east and west is measured.

2. Prime Meridian The meridian passing through Greenwich, England, designated as the zero meridian (0°) by an international conference in 1884.