adjective

tertiary

tertiary, third

He is studying at a tertiary institution.

He is studying at a tertiary institution.

The tertiary sector of the economy is growing.

The tertiary sector of the economy is growing.

tertiary ((noun)) third in order or level He is studying at a tertiary institution.

Synonyms: third, third-rate

From Latin 'tertiarius', from 'tertius' meaning 'third'.

Remember the sequence: 1st = primary, 2nd = secondary, 3rd = tertiary. The 'ter-' part sounds like 'three'.

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