regaliter

From rēgālis (“regal, royal”) +‎ -ter (“-ly”, adverb-forming suffix).

• (Classical Latin) IPA^(key): /reːˈɡaː.li.ter/, [reːˈɡäːlʲɪt̪ɛr]
• (modern Italianate Ecclesiastical) IPA^(key): /reˈɡa.li.ter/, [reˈɡäːlit̪er]

rēgāliter (comparative rēgālius, superlative rēgālissimē)

1. royally, kingly; in a manner like or pertaining to a king

• rēx
• rēgālis
• rēgius
• regō
• rēgula

• “regaliter”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers