Often, black ops. a secret mission or campaign carried out by a military, governmental, or other organization, typically one in which the organization conceals or denies its involvement: Some national intelligence agencies use black ops to undermine enemy governments.
The company even resorted to an industrial black op to steal secrets from its competitor.
a dark variety of opal having the characteristic opaline play of color. noun any opal of a dark coloration, not necessarily black
lacking hue and brightness; absorbing light without reflecting any of the rays composing it. characterized by absence of light; enveloped in darkness: a black night. (sometimes initial capital letter) pertaining or belonging to any of the various populations characterized by dark skin pigmentation, specifically the dark-skinned peoples of Africa, Oceania, and Australia. African American. soiled […]
noun (Midland English, dialect) a rough road or track Historical Examples Curly Roger Pocock