[plahy-stuh-seen] /ˈplaɪ stəˌsin/ Geology
noting or pertaining to the epoch forming the earlier half of the Quaternary Period, beginning about two million years ago and ending 10,000 years ago, characterized by widespread glacial ice and the advent of modern humans.
the Pleistocene Epoch or Series.
of, denoting, or formed in the first epoch of the Quaternary period, which lasted for about 1 600 000 years. It was characterized by extensive glaciations of the N hemisphere and the evolutionary development of man
the Pleistocene, the Pleistocene epoch or rock series
“pertaining to the glacial period,” 1839, coined by Lyell from Greek pleistos “most” (superlative of polys “much;” see poly-) + -cene.
The earlier of the two epochs of the Quaternary Period, from about 2 million to 10,000 years ago. The Pleistocene Epoch was characterized by the formation of widespread glaciers in the Northern Hemisphere and by the appearance of humans. Mammals included both small forms, such as saber-toothed tigers and horses and giant ones, such as mammoths and mastodons. Almost all the giant mammals, including woolly mammoths, giant wolves, giant ground sloths, and massive wombats disappeared at the end of the Pleistocene and the start of the Holocene. See Chart at geologic time.
[pli-kah-nawf, -nof; Russian plyi-khah-nuh f] /plɪˈkɑ nɔf, -nɒf; Russian plyɪˈxɑ nəf/ noun 1. Georgi (or Georgy) Valentinovich [gyi-awr-gyee-vuh-lyin-tyee-nuh-vyich] /gyɪˈɔr gyi və lyɪnˈtyi nə vyɪtʃ/ (Show IPA), 1857–1918, Russian philosopher and leader of the Mensheviks. /Russian pljɪˈçɑnof/ noun 1. Georgi Valentinovich (ˈɡjɪorɡji valɪnˈtjinəvjɪʃ). 1857–1918, Russian revolutionary; founder of Russian Marxism and leader of the Russian Social […]
[plee-nuh m, plen-uh m] /ˈpli nəm, ˈplɛn əm/ noun, plural plenums, plena [plee-nuh, plen-uh] /ˈpli nə, ˈplɛn ə/ (Show IPA) 1. the state or a space in which a gas, usually air, is contained at a pressure greater than atmospheric pressure. 2. a full assembly, as a joint legislative assembly. 3. a space, usually above […]
[plee-nuh-ree, plen-uh-] /ˈpli nə ri, ˈplɛn ə-/ adjective 1. full; complete; entire; absolute; unqualified: plenary powers. 2. attended by all qualified members; fully constituted: a plenary session of Congress. noun, plural plenaries. 3. a plenary session, meeting, or the like. /ˈpliːnərɪ; ˈplɛn-/ adjective 1. full, unqualified, or complete: plenary powers, plenary indulgence 2. (of assemblies, […]
noun, Roman Catholic Church. 1. a remission of the total temporal punishment that is still due to sin after absolution. Compare (def 6).