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A manifestation is the proof of the reality of something, often a site or a smell. (noun)

An example of manifestation is the smile on a woman's face when her husband appears, showing how much she loves him.    

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http://www.dictionary.reference.com/browse/manifestion

outward or perceptible indication; materialization: At first there was no manifestation of the disease. 

manifestation |?man?f??st? sh ?n; -?fes?t? sh ?n|
noun
an event, action, or object that clearly shows or embodies something, esp. a theory or an abstract idea : the first obvious manifestations of global warming. See note at sign .
• the action or fact of showing something in such a way : the manifestation of anxiety over the upcoming exams.
• a symptom or sign of an ailment : a characteristic manifestation of Lyme disease.
• a version or incarnation of something or someone : Purity and Innocence and Young Love in all their gentle manifestations.
• an appearance of a ghost or spirit.
ORIGIN late Middle English : from late Latin manifestatio(n-), from the verb manifestare ‘make public.’