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 ?
Manchester United and Arsenal have dominated a topsy-turvy battle all season, with United gaining the upper hand in recent weeks - they are just 2-5 to keep the trophy at Old Trafford with Arsenal and Chelsea 5-1 and Liverpool a distant 120-1.
AN unbeaten century from HD Ackerman failed to stop promotion-chasing Worcestershire from gaining the upper hand against Leicestershire at New Road.
ANIL KUMBLE claimed his 400th Test victim yesterday - but could not stop Australia gaining the upper hand in Bangalore.