"branch of theology which defends Christian belief," 1733, from apologetic (which is attested from early 15c. as a noun meaning "formal defense"); also see -ics.
Entries linking to apologetics
apologetic adj.
1640s, "vindicatory, containing a defense," from French apologétique, from Latin apologeticus, from Greek apologetikos "defensible," from apologeisthai "speak in one's defense," from apologos "an account, story," from apo "away from, off" (see apo-) + logos "speech" (from PIE root *leg- (1).
The meaning "regretfully acknowledging fault or failure" is by 1836 (apologetic for himself). Apologetical is from c. 1600 as "containing or of the nature of a defense;" by 1630s as "regretfully acknowledging fault or failure."
-ics
in the names of sciences or disciplines (acoustics, aerobics, economics, etc.), a 16c. revival of the classical custom of using the neuter plural of adjectives with Greek -ikos "pertaining to" (see -ic) to mean "matters relevant to" and also as the titles of treatises about them. Subject matters that acquired their English names before c. 1500, however, tend to be singular in form (arithmetic, logic, magic, music, rhetoric). The grammatical number of words in -ics (mathematics is/mathematics are) is a confused question.