tertiary
Tertiary (adjective) means Third in order, rank or importance, coming after primary and secondary. Example: “Tertiary causes of the collapse were noted but not investigated.”
How to use tertiary
Learner’s notesIn plain EnglishThe third one in a sequence, after the first and second.
Formal and technical, common in medicine, education policy, economics and colour theory.
The sequence runs primary, secondary, tertiary, quaternary. Tertiary always means third, never merely minor, although what is third is often less important.
Trace the full origin ↓Fill the gap
Can you complete this real example?
_____ causes of the collapse were noted but not investigated.
Etymology
From Latin tertiarius 'of or containing a third part', from tertius 'third'.