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Latin word tertio comes from Latin tertius ((ordinal) third, the ordinal number after and before.), Latin -one(-onem|m).

Tertio etymology history?

Tertio detailed word origin explanation

Dictionary entryLanguageDefinition
tertius Latin (lat) (ordinal) third, the ordinal number after and before.
-one(-onem|m) Latin (lat)
tertio Latin (lat) (transitive) I do for the third time, thrice. For the third time. In the third place, thirdly. Three times, thrice.