1) Age 2) Palaeolithic 1) Palaeolithic 2) Period 3) Period of time 4) Time period 
The Paleolithic (US spelling; British spelling: Palaeolithic; pronunciation: k or -) Age, Era or Period is a prehistoric period of human history distinguished by the development of the most primitive stone tools discovered (Grahame Clark`s Modes I and II), and covers roughly 99% of human technological prehistory. It extends from the earliest know....
• (a.) 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.
10,000-7000BC (Britain) Resettlement of Britain as the ice sheet retreats. See TIMELINE
A stage of the history of mankind which is characterized by the use and manufacture of stone tools (lithics).
Pa`le·o·lith'ic adjective (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. 
[adj] - of or relating to the second period of the Stone Age (following the eolithic)
palaeolithic adjective of or relating to the second period of the Stone Age (following the eolithic); `paleolithic artifacts`