Opinio ended in 2008.

Opinio was created in 2007.

Opinio juris refers to an opinion of the law. This is what someone feels in reaction to something that was done due to a legal obligation.

This is more of an opinio but yes I think it is.

The Latin equivalent of the English observation 'Opinio juris becomes jus cogens' is Opinio juris fit ius cogens. The all-English equivalent is The opinion of the court becomes the binding law. In the word-by-word translation, the noun 'opinio' means 'opinion'. The noun 'juris' means 'of the court'. The verb 'fit' means '[he/she/it] becomes, does become, is becoming'. The noun 'ius' means 'law'. The participle 'cogens' means 'binding'.