ICS
-ics
Definition: . A suffix used in forming the names of certain sciences,
systems, etc., as acoustics, mathematics, dynamics, statistics,
politics, athletics.
Note: The names sciences ending in ics, as mathematics, mechanics,
metaphysics, optics, etc., are, with respect to their form, nouns in
the plural number. The plural form was probably introduced to mark
the complex nature of such sciences; and it may have been in
imitation of the use of the Greek plurals ics were construed with a
verb or a pronoun in the plural; but it is now generally considered
preferable to treat them as singular. In Greman we have die
Mathematik, die Mechanik, etc., and in French la metaphysique, la
optique, etc., corresponding to our mathematics, mechanics,
metaphysics, optics, etc.
Mathematics have for their object the consideration of whatever is
capable of being numbered or measured. John Davidson.
The citations subjoined will serve as examples of the best present
usage.
Ethics is the sciences of the laws which govern our actions as moral
agents. Sir W. Hamilton.
All parts of knowledge have their origin in metaphysics, and finally,
perhaps, revolve into it. De Quincey.
Mechanics, like pure mathematics, may be geometrical, or may be
analytical; that is, it may treat space either by a direct
consideration of its properties, or by a symbolical representation.
Whewell.
Source: Webster’s Unabridged Dictionary 1913 Edition