designating or of an Old World cultural period (c. 10,000-c. 8000 ) between the Paleolithic and the Neolithic, characterized by the earliest exploitation of local and relatively permanent food resources and the use of microliths
See Mesolithic in American Heritage Dictionary 4
(mĕzˌə-lĭthˈĭk, mĕsˌ-)
adjective
Of or relating to the cultural period of the Stone Age between the Paleolithic and Neolithic periods, marked by the appearance of microlithic tools and weapons and by changes in the nature of settlements.
noun
The Mesolithic Period. Also called Middle Stone Age. See Usage Note at Three Age system.