sessorium

From sessor +‎ -ium, i.e. "something of the sitter", or equivalently, from sedeo (“to sit, be seated”) +‎ -tōrium (suffix forming nouns denoting places).

• (Classical) IPA^(key): /sesˈsoː.ri.um/, [s̠ɛs̠ˈs̠oːriʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /sesˈso.ri.um/, [sesˈsɔːrium]

sessōrium n (genitive sessōriī or sessōrī); second declension

1. seat
2. stool, chair
3. place of residence, a dwelling, a habitation
4. (New Latin) living room (a place to sit)
   • 2003, J. K. Rowling, translated by Peter Needham, Harrius Potter et Philosophi Lapis, London: Bloomsbury, translation of Harry Potter and the Philosopher's Stone, page 5:

     in sessorium iit eo tempore quo nuntius novissimus commentariorum vespertinorum emittebatur.

     [original: he went into the living-room in time to catch the last report on the evening news]

Second-declension noun (neuter).

¹Found in older Latin (until the Augustan Age).

• “sessorium”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• sessorium in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• sessorium in du Cange, et al., Glossarium mediae et infimae latinitatis, éd. augm., Niort : L. Favre, 1883‑1887.