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Slovene has three levels of politeness:

* ti (second person singular)

* vi (second person plural)

* oni (third person plural) -- archaic

Same in Slovak (just first two are written with 'y' instead of 'i')

Romanian:

* tu (second person singular, informal)

* dumneata (second person singular, semi-formal)

* dumneavoastră (second person plural, formal)

"dumne" comes "domn" aka "sir".