A Definition (n.) draws a sharp boundary where you like — and it will never entirely coincide with actual usage, since usage has no sharp boundary.
A Definition (n.) is what we mistakenly think will cure the trouble — like the hunger felt in certain indigestion, which eating cannot remove.
A Definition (n.) only takes you one step back to something undefined — everyone knows it, and still loses sight of it.
A Definition (n.) need not be an abbreviation; it may make new connections, by brackets or by colouring the signs.
A Definition (n.) is not an analysis of what goes on inside one while uttering the word.
A Definition (n.) cannot be denied and so has no sense; it is a rule by which one proceeds, as children learn 2 times 2 is 4 but never 2 is 2.
A Definition (n.) may substitute one sign for another and still matter, since its significance lies in its application, its importance for life.
A Definition (n.) is a tautology showing internal relations between its two terms.