Tilavuudessaan
Tilavuudessaan is a Finnish inflected form of the noun tilavuus, meaning volume or capacity. The form combines the inessive case marker and a third-person possessive suffix, yielding a expression that translates roughly to "in its volume" or "within its capacity." The exact construction reflects Finnish grammar, where the location marker -ssa/-ssä (in) is joined with the possessive suffix -nsa/-nsä (his/her/its).
In use, tilavuudessaan appears in descriptive or technical contexts where an object's interior space or capacity
Etymology-wise, tilavuudessaan derives from tilavuus (volume) with the typical Finnish compound suffixes for possession and location.