line

Line (from the Latin linea "line, directional cord, edge") stands for:

in everyday language a longer, straight or curved (drawn or similar) line
mathematically a coherent, one-dimensional geometric structure without transverse extension, generic term for curve , straight line and line
the shortest connection between two points on a surface or in a space, see geodesics
Line (traffic) , the regular service of a certain route by public transport
a railway line in Austria and Switzerland

Lineage , a genetic direct line in which living things are related to one another

Line (unit) , an old French and German measure of length, used in precision mechanics

In physics, it is short for emission line , see spectral line

in fashion an abstract dress form, see silhouette (fashion)

an arrangement of cocaine for sniffing, see cocaine #consuming

colloquial for climbing route

a battle formation of the infantry, see linear tactics

a marching and combat formation of a fleet, see keel line (formation)

Line instance, a position with authority within an organization, see line organization

a certain data density with screened resolution, see point density

the "columns" of the chess board that are perpendicular to the chess players

See also:

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