The word 'tonal' is built upon the core concept of 'tone', which originates from the Greek 'tonos', meaning tension, stretching, or pitch. This term entered Latin as 'tonus', referring to a sound, accent, or musical note. In English, the suffix '-al', of Latin origin, is appended to the root 'ton' to form an adjective, shifting the meaning from the thing itself to a quality related to it. Thus, 'tonal' directly describes anything pertaining to musical tones, vocal pitch, or the key system in music, preserving the ancient link between tension and sound.

Structure: ton (tone) + al (adjective suffix) 'ton' from Latin 'tonus' (sound, tone), from Greek 'tonos' (tension, tone). 'al' is an English adjective-forming suffix from Latin '-alis'.