signal

The word 'signal' entered English in the late Middle English period via Old French signal, from Medieval Latin signale. This, in turn, derives from the Late Latin neuter form signalis, meaning "of a sign," which is built upon the classical Latin noun signum (a mark, token, indication, or military standard). The core concept of signum can be traced further back to the Proto-Indo-European root sekw-, meaning "to point out" or "to show," which also gives us words like 'sign' and 'design'. Thus, a 'signal' is literally something that relates to or functions as a sign, evolving from a physical mark to encompass any deliberate gesture, sound, or transmitted impulse intended to convey information or command attention.

Structure: sign (mark) + al (relating to) - sign: From Latin signum (mark, token, sign). Functions as the core root conveying the core meaning of a distinguishing mark or indication. - al: From Latin adjectival suffix -alis. Functions as a suffix forming adjectives (and later nouns) meaning "of, relating to, or characterized by" the root.