Noun

(en noun)

A large single block of stone, used in architecture and sculpture.

*{{quote-magazine, date=2012-01

, author= , title=The Washington Monument , volume=100, issue=1, page=16 , magazine= citation , passage=The Washington Monument is often described as an obelisk, and sometimes even as a “true obelisk,” even though it is not. A true obelisk is a monolith , a pylon formed out of a single piece of stone.}}

Anything massive, uniform and unmovable.

(chemistry, chromatography) A continuous stationary-phase as a homogeneous column in a single piece.

Noun

(en noun)

A hill or mountain standing isolated above a predominately flat plain.

* 1901 , Philip Emerson, Notes on the New England Upland about the White Mountains'', in ''Appalachia , vol. IX, p57

Eastward from the White Mountains, the open sea of the upland country comes right to the monadnock' shore, with hardly an outlying island; southward the upland is covered for miles by an archipelago of ' monadnock groups and peaks.