What exactly should I've written to communicate my question in How does the prefix 'in-' in 'intonation' relate to the difference between 'tone' and 'intonation'?? My writing probably wasn't punctilious or pinpoint enough to communicate what I was trying to ask:
Because the nouns 'tone' and 'intone' differ only by the prefix 'in-', 'in-' (and not some other prefix) must have been chosen because it somehow communicates the difference(s) between ⟨tone⟩ and ⟨intone⟩. So what does 'in-' (in 'intone') communicate in ⟨intone⟩ that 'in-' can't in ⟨tone⟩?
I.e.: why was 'tone', and not 'intone', chosen to mean ⟨tone⟩? Conversely, why wasn't 'intone' chosen to mean ⟨tone⟩?