Church observance is a term used to refer to the religious ceremonies and rituals that are practiced by members of a particular church. The term can also be used to describe the way in which a church follows its own set of rules and regulations. In this context, the crossword solution 'RITE' refers to a specific ceremony or ritual that is part of a church's observance. This could include things such as baptisms, weddings, funerals, or other special services.