tercentennial tercentenary • tercer · · · Info · Definitions · Synonyms · Characters · · tercentennial · · Text Latin · · Script 13 · · Length Definitions · · · (noun) the 300th anniversary (or the celebration of it). Synonyms: tercentenary, triennial. · · Noun Definition 1 Synonyms · · · tercentenary · · Synonym 1 triennial · · Synonym 2 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074