HISTORICAL AND CRITICAL.
Those now who propose to hold mutual discussion must needs
understand one another somewhat: for without this how can
they have any mutual discussion? Each of their words then,
must be familiar and have definite meaning, and not many
meanings, but one only, and if it have more meanings than
one, they must make it clear in which of these senses it is
used.
Aristotle, Metaph., Book X, c. 5, § 3.