A trench is an excavation defined by its depth being greater than its width. The U.S. Occupational Safety and Health Administration, or OSHA, says that trenches have many safety hazards that trench workers must be wary of. To protect workers from accidents and injuries, trench depth standards are set by OSHA.
Approbation is an official, important-sounding, and somewhat old-fashioned word for approval or praise. A princess, for example, might only consider marrying a prince that is met with her father's, the King's, approbation. How is it possible that approbation means approval when probation is a form of being in trouble in school? Remember that probation is a testing period, to see if you can be good. Approbation means it's all good. Or you can remember this rhyme: Filled with approbation, the audience gave a standing ovation..
Appurtenance. An Accessory or adjunct that is attached and incidental to something that has greater importance or value. As applied to real property, an object attached to or a right to be used with land as an incidental benefit but which is necessary to the complete use and enjoyment of the property.