Professor of Computer Science: A kiss is a few bits of love compiled into a byte.
Professor of Algebra: A kiss is two divided by nothing.
Professor of Geometry: A kiss is the shortest distance between two straight lines.
Professor of Physics: A kiss is the contraction of mouth due to the expansion of the heart.
Professor of Chemistry: A kiss is the reaction of the interaction between two hearts.
Professor of Dentistry: A kiss is infectious and antiseptic.
Professor of Accounting: A kiss is a credit because it is profitable when returned.
Professor of Economics: A kiss is that thing for which the demand is higher than the supply.
Professor of Philosphy: A kiss is the persecution for the child, ecstasy for the youth, and homage for the old.
Professor of English: A kiss is a noun that is used as a conjunction; it is more common than proper; it is spoken in plural, and it is applicable to all.
Professor of Engineering: Uh, what? I'm not familiar with that term.