Meaning

noun according with conscience or morality

noun appropriate conduct; doing the right thing

noun conformity to fact or truth

originFrom Middle English rightnesse, riȝtnesse, rihtnesse, from Old English rihtnes, rehtnis, from Proto-West Germanic *rehtanassī (“rightness, justice”), equivalent to right + -ness. Cognate with West Frisian rjochtens (“rightness”), Middle Dutch rechtenesse (“rightness, justification”), Old High German rehtnissa (“justice”).

Etymology from Wiktionary, CC BY-SA 3.0