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clearance

noun [C or U] (NOT TOUCHING)
 
 
/ˈklɪə.rəns/ US  /ˈklɪr.əns/

Definition

the distance or space that is needed for one thing to avoid touching another thing: It was difficult getting the piano through the doorway because we only had a clearance of a few centimetres. High vehicles must take an alternative route because of low clearance under the bridge.Space - general wordsAreas of land in general
(Definition of clearance noun (NOT TOUCHING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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