Professors of different subjects define the same word in different ways. Professor of Algebra; A kiss is divided by nothing. Professor of Chemistry; A kiss is a reaction of interaction between two hearts. Professor of Philosophy; A kiss is a persecution for a child ecstasy for the youth, and homage for the old. Professor of Accountancy; A kiss is a credit because it is profitable when returned. Professor of Zoology; A kiss is an interchange of unisexual salivary bacteria. Professor of Physics; A kiss is a contraction of the mouth due to the expansion of the heart. Professor of Economics; A kiss is that thing for which demand is higher than supply. Professor of Geometry; A kiss is a shortest distance between two straight lines. Professor of Physiology; A kiss is juxtaposition of the orbicularis oris muscles in the state of contraction. Professor of Dentistry; A kiss is infectious and antiseptic. Professor of English Language; A kiss is a noun that is used as a conjunction, its more than proper; Its spoken in plural and it is applicable in all gender.