Definition of "tertia" [tertia]

• One of three divisions; a third: for a special use, see the extracts. (noun)

The Century Dictionary (Public Domain)

• "1727C: De pusillis autem in tertia persona loquitur; de discipulis vero in secunda, Matthaei 18."
• "Classes were once more discontinued from 1306 to 1313, when Clement V commanded the "tertia" to be used in restoring the churches."
• "_Nuovo lume_ [612] the use of ordinals is quite confused, the propositions on a single page being numbered "tertia," "4," and "V.""