upper

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upper

1. Geology archaeol denoting the late part or division of a period, system, formation, etc.
2. Maths (of a limit or bound) greater than or equal to one or more numbers or variables
3. Informal any tooth of the upper jaw
4. Slang any of various drugs having a stimulant or euphoric effect

upper

[′əp·ər]
(geology)
Pertaining to rocks or strata that normally overlie those of earlier formations of the same subdivision of rocks.
References in periodicals archive ?
imperialist interests from gaining the upper hand in Iraq?
Buyers in the South of England are gaining the upper hand in the housing market as sellers show greater willingness to trim prices.
CRICKET: Anil Kumble reached 400 Test wickets yesterday -- but he could not stop Australia gaining the upper hand on the opening day of the first Test in Bangalore.