Rightful means belonging by right. The rightful owner, the rightful heir, take her rightful place.
It goes before the noun and is used almost entirely in a small set of phrases: rightful owner, rightful heir, rightful place. It is a claim about entitlement rather than about possession — the rightful owner is by definition not currently holding the thing, which is why the phrase appears in police reports and fairy tales alike. Note rightfully, and rightly, which is a different word about correctness.
1adjectiverightfulBelonging by right.
“After years in exile, the prince returned to claim his rightful throne.”
rightful is a quality of entitlement.
Old English riht plus -full, both native. The word has meant entitled by right since Middle English and has never widened beyond that, which is why its phrases feel fixed.
Proto-Indo-European
*h₃reǵ-
Old English
*rihtfull
Middle English
rightful
English, today
rightful
Built from
From Middle English rightful, ryghtfull, riȝtful, from Old English rihtfull (suggested by derivative unrihtfull (“unrightful”)), equivalent to right + -ful.
Etymology from Wiktionary, CC BY-SA