1. A bitter pungency or penetrating taste combined with a burning flavor: Some people think that the acritude of an old strong smelling cheese cannot be tolerated and so they avoid having it on the table!
2. A caustic or harsh temper or bitterness in language: James was so tired and upset with the unruly students in his class that the acritude in his manner of speaking came through unexpectedly and all of the children were suddenly very quiet!