Avaimessa
Avaimessa is the inessive singular form of the Finnish noun avain, meaning key. In Finnish grammar, the inessive case (ending -ssa or -ssä) marks location or state of being inside something. Therefore ava i messa literally translates to “in the key” and is primarily encountered as an example in linguistic descriptions of Finnish case inflection rather than as a common everyday expression. The form is often found in dictionaries, grammar guides, and language-learning materials as an illustration of how the inessive suffix attaches to a noun ending in -in.
In practical use, speakers rarely employ avaimessa in ordinary conversation to convey a literal meaning. When
Etymology: formed from the noun avain (key) plus the inessive suffix -ssa.