1. A sports field or playing area that lacks official approval, licensing, or authorization from governing bodies or authorities
The children played soccer on an unsanctioned field behind the school.
As crianças jogavam futebol em um campo não autorizado atrás da escola.
2. An area of professional or academic study that is not formally recognized or accredited by institutions
He pursued research in an unsanctioned field without institutional support.
Ele prosseguiu pesquisas em um campo não autorizado sem apoio institucional.