Definition for first-order - Oxford Dictionaries Online (World English)

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	first-order (first-order) adjective relating to the simplest or most fundamental level of organization, experience, or analysis; primary or immediate: for a teacher, of course, drama must be a first-order experience technical having an order of one, especially denoting mathematical equations involving only the first power of the independent variable or only the first derivative of a function: a simple first-order differential equation		Search results in the dictionary of the first order or magnitude in first equation of the first or second etc. order in equation More results » Nearby Words First World First World War first-day cover first-degree first-foot first-generation first-hand first-line first-nighter first-order first-rate first-time buyer firstborn firstling firstly firth Firth, J. R. fisc fiscal