Definitions:
an instance of a particular situation; an example of something occurring

an instance of a disease, injury, or problem

a legal action, especially one to be decided in a court of law

any of the forms of a noun, adjective, or pronoun that express the semantic relation of the word to other words in the sentence

a container designed to hold or protect something

each of the two forms, capital or minuscule, in which a letter of the alphabet may be written or printed.

surround in a material or substance

reconnoitre (a place) before carrying out a robbery