Paleolithic refers to the period between approximately 40,000 and 10,000 years ago. "Upper" is the most recent of three sub-divisions of the Paleolithic period (Lower, Middle and Upper). The word itself is made of two parts. "Paleo" which means old and "lithic" which means stone. Paleolithic is [..]

of or pertaining to the Earlier Stone Age (opposed to neolithic), 1865, coined by John Lubbock, later Baron Avebury (1834-1913), from paleo- + Greek lithos "stone" + -ic.

The early stage of the Stone Age, beginning about 750,000 years ago. During this time humans relied on stone technology to sustain their scavenging, hunting and gathering lifestyle.

(n) second part of the Stone Age beginning about 750,00 to 500,000 years BC and lasting until the end of the last ice age about 8,500 years BC(adj) of or relating to the second period of the Stone Age [..]

Referring to the early Stone Age, about 8,000 to 15,000 years ago.

the archaeological period before c.10,000 BC, characterized by the earliest known stone tool manufacture.

the earliest designated Old World cultural period beginning about 750,000 years ago, characterized by the first chipped stone tools

Literally the Old Stone Age, the period when humans relied on a stone technology to sustain a scavenging/hunting/gathering adaptation. The archaeological period before 10,000 BC

A stage of the history of mankind which is characterized by the use and manufacture of stone tools (lithics).

Old Stone Age, begins around 500.000 years ago and ends with the Mesolithic around 7000 BCE

Or Old Stone Age, the period of prehistory characterized by chipped and flaked stone tools and hunting and gathering.