Professors of different subjects define the same word in different ways:
Prof. of Computer Science:
A kiss is a few bits of love compiled into a byte.
Prof. of Geometry:
A kiss is the shortest distance between two straight lines.
Prof. of Physics:
A kiss is the contraction of mouth due to the expansion of the heart.
Prof. of Chemistry:
A kiss is the reaction of the interaction between two hearts.
Prof. of Physiology:
A kiss is the juxtaposition of two orbicular ors muscles in the state of contraction.
Prof. of Accountancy:
A kiss is a credit because it is profitable when returned.
Prof. of Economics:
A kiss is that thing for which the demand is higher than the supply.
Prof. of English:
A 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.
Prof. of Engineering:
Uh, What? I’m not familiar with that term.