[ Gr. ne`os youthful, new. See New. ] A prefix meaning new, recent, late; and in chemistry designating specifically that variety of metameric hydrocarbons which, when the name was applied, had been recently classified, and in which at least one carbon atom is connected directly with four other carbon atoms; -- contrasted with normal and iso-; as, neopentane; the neoparaffins. Also used adjectively. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. ne`os new + &unr_;, &unr_;, a kind of crustacean. ] (Zool.) The modern, or true, Crustacea, as distinguished from the Merostomata. [ 1913 Webster ]

a. [ Neo- + Gr. ne`os new. ] (Geol.) More recent than the Eocene, that is, including both the Miocene and Pliocene divisions of the Tertiary. [ 1913 Webster ]

n. [ Neo- + Christianity. ] Rationalism. [ 1913 Webster ]

a. [ Neo- + classic. ] Belonging to, or designating, the modern revival or adaptation of classical, esp. Greco-Roman, style, taste and manner of work in architecture, arts, literature, etc. [ Webster 1913 Suppl.+ WordNet 1.5 ]

. All that architecture which, since the beginning of the Italian Renaissance, about 1420, has been designed with deliberate imitation of Greco-Roman buildings. [ Webster 1913 Suppl. ]

n. a revival of the classical Greek and Roman style in art or literature. [ WordNet 1.5 ]

n. an advocate of neoclassicism. [ WordNet 1.5 ]

n. Control by a powerful country of its former colonies (or other less developed countries) by economic pressures. In contrast to colonialism, in which one country controls another territory by military force. [ WordNet 1.5 ]

n. [ From Neocomium, the Latin name of Neuchatel, in Switzerland, where these rocks occur. ] (Geol.) A term applied to the lowest deposits of the Cretaceous or chalk formation of Europe, being the lower greensand. [ 1913 Webster ]