Definition of Kiss

Prof .of Economics

Kiss is that thing for which the demand is aways higher than the supply.
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Prof. Of Accountancy

Kiss is a credit because it is profitable when returned.
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Prof. Of Algebra

Kiss is infinity because two divided by nothing.
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Prof. Of Geometry

Kiss is the shortest distance between two lips.
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Prof. Of Physics

Kiss is the contraction of mouth due to the expansion of the heart.
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Prof. Of Chemistry

Kiss is the reaction of the interaction between two hearts.
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Prof. Of Zoology

Kiss is the interchange of salivary bacteria.
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Prof. Of Physiology

Kiss is the juxtaposition of two orbicularisoris muscles in the state of contraction.
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Prof. Of Dentistry

Kiss is infectious and antiseptic.
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Prof. Of Philosophy

Kiss is the persecution for the child, ecstasy for the youth and homage for the old.
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Prof. Of English

Kiss is a noun that is used as a conjunction, it is more common than proper, 

it is spoken in the plural and it is applicable to all.
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Prof. Of Architecture

Kiss is a process which builds a solid bond between the two dynamic objects
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Prof. Of Comp.Science

What is a kiss? It seems to be an undefined variable