a. [ Gr. 'archai^os ancient + liqiko`s pertaining to a stone. ] (Archæol.) Of or pertaining to the earliest Stone age; -- applied to a prehistoric period preceding the Paleolithic age. [ 1913 Webster ]

a. [ Neo- + -lith + -ic. ] (Archaeol. & Geol.) Of or pertaining to, or designating, an era characterized by late remains in stone; the late stone age. Estimated as beginning around 9000 b. c. in the Middle East, this period is characterized by the beginnings of farming, the domestication of animals, and the manufacture of textiles and pottery. [ 1913 Webster +PJC ]

The Neolithic era includes the latter half of the “Stone age;” the human relics which belong to it are associated with the remains of animals not yet extinct. The kitchen middens of Denmark, the lake dwellings of Switzerland, and the stockaded islands, or “crannogs, ” of the British Isles, belong to this era. Lubbock. [ 1913 Webster ]

adj. Same as paleolithic.
Syn. -- paleolithic. [ WordNet 1.5 ]

a. (Geol.) Of or pertaining to an era marked by early stone implements. The Paleolithic era (as proposed by Lubbock) includes the earlier half of the “Stone Age;” the remains belonging to it are for the most part of extinct animals, with relics of human beings. [ 1913 Webster ]