business casual

Short definition from Wiktionary

Noun

1. 1
   Any standard of dress used in many business environments that is casual overall; it thus excludes most formal clothes (such as a business suit and tie) but also excludes certain overly casual clothes (such as short shorts).
2. 2
   Alternative form of business casual.

Adjective

1. 1
   Designating such a style of dress.
2. 2
   Alternative form of business casual.