III (EN)

symbol, symbol

symbol “III”

1. the Roman numeral for three
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   The clock face displayed the time as III.
2. (chemistry) indicating an oxidation state of three
   Iron(III) chloride is used in water treatment.
3. (spectroscopy) indicating an atom that has lost two electrons
   The emission lines of Fe III were observed.
4. (music) representing the chord built on the third scale degree
   The song begins with a progression from I to III.

symbol “III”

1. used after names to indicate the third person with that name
   He was named John III after his father and grandfather.