a rocket-propelled guided missile that can escape the earth's atmosphere; makes observations of the solar system that cannot be made by terrestrial observation
the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)
a compound made artificially by chemical reactions
of a proposition whose truth value is determined by observation or facts; "`all men are arrogant' is a synthetic proposition"
systematic combining of root and modifying elements into single words
involving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis; "limnology is essentially a synthetic science composed of elements...that extend well beyond the limits of biology"- P.S.Welch
not genuine or natural; "counterfeit rhetoric that flourishes when passions are synthetic"- George Will
excessively and uncomfortably conscious of your appearance or behavior; "self-conscious teenagers"; "wondered if she could ever be untidy without feeling self-conscious about it"
aware of yourself as an individual or of your own being and actions and thoughts; "self-conscious awareness"; "self-conscious about their roles as guardians of the social values"- D.M.Potter
a piece of land prepared for playing a game; "the home crowd cheered when Princeton took the field"
the circumstances under which competition occurs; "the government's objective is to insure a genuinely level playing field for American industry and commerce in Europe"