"NORMAS CONTRATUAIS OMISSAS" translates to "OMITTED CONTRACTUAL RULES" in English because it refers to rules that have not been specifically included in a contract.

Examples:
1. The agreement will be governed by the law of the land, with any omitted contractual rules to be filled in by the relevant statutory provisions.
2. In case of any ambiguity, the omitted contractual rules will be supplemented by the appropriate legal provisions.

português term (edited): normas contratusais omissas

Ao presente Contrato Social aplicam-se supletivamente, no que couber, a disposição legal da Lei das Sociedades por Ações (Lei no 6.404/76) : to fill in the gaps, the statutory enactment known as the Joint-Stock Companies / BrE: Limited Companies Act shall apply to this Shareholders' Agreement / BrE: Memorandum of Association / OzE: Association Agreement or -> This Shareholders' Agreement shall be governed by -----

I don't think it means where there any absence of contract *law* rules, as in omitted contractual rules.

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Note added at 1 hr (2024-03-06 23:56:40 GMT)
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contratuais...

I don't think it's about 'omissions', or Adrian's Latin translation of this word. It's simply saying that the following provision also applies.

https://www.google.com/search?q="provisions not * herein"&sc...