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tertiary 
1  adj Tertiary means third in order, third in importance, or at a third stage of development. 
FORMAL He must have come to know those philosophers through secondary or tertiary sources.  
2  adj Tertiary education is education at university or college level. 
 (BRIT) ADJ n 
...institutions of tertiary education.  
in AM, use  higher education  


tertiary sector   (tertiary sectors plural )The tertiary sector consists of industries which provide a service, such as transport and finance.  (BUSINESS)  n-count 
...economies that are slowly increasing the proportion of their labour force in the tertiary sector.