Definitions for ics
Random House Webster's College Dictionary
ethics; physics; politics; tactics.
Category: Affix, Usage Note
Ref: a suffix of nouns that denote a body of facts, knowledge, principles, etc., usu. corresponding to adjectives ending in -ic 1 or -ical
* Usage: Nouns ending in -ics that name fields of study, sciences, arts, professions, or the like are usu. not preceded by an article and are used with a singular verb: Acoustics (the science) deals with sound. Politics (the art of government) fascinates me. In certain uses, often when preceded by a determiner like the, his, her, or their, most of these nouns can take a plural verb: The acoustics (the sound-reflecting qualities) of the hall are splendid. Their politics (political opinions) have antagonized everyone.
Origin of -ics:
pl. of -ic , repr. L -ica
International College of Surgeons.