up·per (?p??r)adj.1. Higher in place, position, or rank: the upper bunk; the upper half of the class.2. a. Situated on higher ground: upper regions.b. Lying farther inland: the upper Nile.c. Northern: the upper Midwest.3. Upper Geology & Archaeology Of, relating to, or being a later division of the period named.4. Denoting the smaller and usually less broadly representative house of a bicameral legislature.n.1. The part of a shoe or boot above the sole.2. Informal An upper berth.3. uppers Informal The upper teeth or a set of upper dentures.4. Slang a. A drug, especially an amphetamine, used as a stimulant.b. An exhilarating or euphoric experience.Idiom: on (one’s) uppers Informal Impoverished; destitute.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.upper (??p?) adj1. higher or highest in relation to physical position, wealth, rank, status, etc2. (Physical Geography) (capital when part of a name) lying farther upstream, inland, or farther north: the upper valley of the Loire. 3. (Geological Science) (capital when part of a name) geology archaeol denoting the late part or division of a period, system, formation, etc: Upper Palaeolithic. 4. (Archaeology) (capital when part of a name) geology archaeol denoting the late part or division of a period, system, formation, etc: Upper Palaeolithic. 5. (Mathematics) maths (of a limit or bound) greater than or equal to one or more numbers or variablesn6. the higher of two objects, people, etc7. (Clothing & Fashion) the part of a shoe above the sole, covering the upper surface of the foot8. on one’s uppers extremely poor; destitute9. (Dentistry) informal any tooth of the upper jaw10. (Recreational Drugs) slang Also called (esp US): up any of various drugs having a stimulant or euphoric effect. Compare downerCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014up?per1 (??p ?r) adj. 1. higher, as in place, position, pitch, or in a scale: the upper stories of a house. 2. superior, as in rank, dignity, or station. 3. (of places) at a higher level, more northerly, or farther from the sea: upper New York State. 4. (often cap.) denoting a later division of a geologic period, system, or the like: the Upper Devonian. n. 5. the part of a shoe or boot above the sole, comprising the quarter, vamp, counter, and lining. 6. an upper berth. 7. Usu., uppers. a. an upper dental plate. b. an upper tooth. Idioms: on one’s uppers, Informal. poor; without means. [1300?50; Middle English] up?per2 (??p ?r) n. Slang. a stimulant drug, esp. an amphetamine. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.