zero-zero \| ̷ ̷(ˌ) ̷ ̷| ̷ ̷(ˌ) ̷ ̷\adjective 1.: characterized by or being atmospheric conditions reducing ceiling and visibility to zero < a zero-zero fog > < zero-zero weather > 2.: limited to zero by atmospheric conditions < ceiling and visibility may be unlimited one moment, and zero-zero seven minutes later — All Hands >