plan

Plan stands for:

an open space, also called village green, the central square of certain village forms, see Anger
Plan (representation) , a summarizing graphic overview
Plan (cartography) , large-scale maps
the idea of a future sequence of actions, see planning

Plan is a proper name for:

Der Plan , a music group, pioneer of the Neue Deutsche Welle
plan (Architecture Biennale Cologne) , event founded in 1999 as an international forum for current architecture (since 2011 in the biennale rhythm) in Cologne
Plan International , a children's charity
Plan (magazine) , an Austrian literary and cultural magazine published from 1945 to 1948
The Plan (Battlestar Galactica) , a 2009 TV movie

Geographically, plan stands for:

a city in the Czech Republic, see Planá u Mariánských Lázní
a French commune in the Isère department, see map (Isère)
a village in the commune of Divonne-les-Bains in the Ain department in France
Plan (Huesca) , a place in the Spanish province of Huesca
Plan (Samnaun) , a village in the Swiss municipality of Samnaun
Plan (Selva di Val Gardena) and Plan de Gralba , districts of Selva di Val Gardena , South Tyrol, Italy
the German name of some places in the Czech Republic, see Plana
a district of the municipality of Pragelato in the province of Turin, Italy

The adjective plan stands for:

in technology, an indication of the form tolerance (ISO 2768-2), see form tolerance # straightness
in mathematics, the property of points (or a surface) to lie in a plane, see planarity
a level construction area, especially for road and rail construction, see planum

PLAN is an abbreviation for:

People's Liberation Army of Namibia , historic military branch of SWAPO
People's Liberation Army Navy , the naval forces of the People's Republic of China
PowerLAN , a technology for data transmission over the power grid
Programming Language Nineteen-hundred , a machine-level programming language of the ICL mainframe computer series 1900, see International Computers Limited
Synonym for Infantile Neuroaxonal Dystrophy

See also:

Wiktionary: Plan - explanations of meanings, word origins, synonyms, translations