IPA: /vɪˈsɛrɡəli/
KK: /vɪˈsɛrɡəli/
In a manner that resembles or is characteristic of a viceroy, who is a representative of a monarch in a colony or territory.
The governor acted viceregally, making decisions that reflected the authority of the crown.
Viceregally → It is formed from "vice-" (meaning in place of) and "regalis" (from Latin, meaning royal). The word "viceregally" refers to something done in the manner of a viceroy, who acts in place of a king or queen.
Think of someone acting 'in place of' ('vice-') a 'royal' ('regalis') figure — that's why viceregally means acting in a royal capacity.