endings originally occurring in adaptations (through F. and L.) of Gr. adjs. in -λογικός, derived from adjs. and sbs. in -λογος, -λογον, which have derivative nouns of quality or function in -λογία, represented in Eng. by -LOGY. As the meaning of an adj. in -logic(al) may with substantial correctness be rendered by ‘pertaining to —logy,’ such adjs. are commonly apprehended as derivatives of the related sbs. (as if f. —logy + -IC). In general, the existence of a sb. in -logy now implies the potential existence of a correlative adj. in -logical (the exceptions being confined to a few of the older words, such as apology, which have corresponding adjs. of different formation). For the difference in meaning between adjs. in -logic and the (now much more frequent) adjs. in -logical, see -ICAL, and cf. the note under GEOLOGIC 1.
