TERTIARY PERIOD(noun)Did you mean?Synonyms RhymesAlso try..periodtertiaryDefinitions There is 1 meaning of the phrase Tertiary Period. Tertiary Period - as a noun The period from 63 million to 2 million years ago Synonyms (Exact Relations)tertiary11Word Variations & RelationsAnagramsStarts TStarts TEStarts TERStarts TERTEnds DEnds ODEnds IODEnds RIODStarts T & ends DStarts TE & ends DStarts T & ends ODA-Z Proximitiestertials8tertian7tertians8tertiaries10tertiary11 Tertiary Period tertias7tertigravidatertium9tertius7tertiuses9