apparently this is the term of art that is used nowadays, pls. read thru both Wikipedia versions: ENG & PORT

http://en.wikipedia.org/wiki/Findability
Findability is a term for the ease with which information contained on a website can be found, both from outside the website (using search engines and the like) and by users already on the website. Although findability has relevance outside the World Wide Web, it is usually used in the context of the web. The popularization of the term "findability" for the Web is usually credited to Peter Morville

http://pt.wikipedia.org/wiki/Encontrabilidade
Encontrabilidade é a qualidade de interação entre um usuário e uma interface (assim como a usabilidade), que refere-se à algo poder ser encontrado pelo usuário. Um exemplo seria a capacidade que um site tem de ser encontrado na Internet através de mecanismos de busca.




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Note added at 4 dias (2010-11-08 13:43:56 GMT) Post-grading
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Lattuca,

Obrigado pela sua escolha.

Ats,
Gilmar