the.com/successor

The next in line, whether the throne wants them or the knife does.

means A person or thing that comes after and takes the place of another, inheriting their role, title, or position.

from From Latin successor, 'one who follows after,' built on succedere — sub- ('under, up from below') plus cedere ('to go, yield'). The image is of someone coming up from behind to step into a place just vacated; the same cedere gives English a whole family of motion words like 'cede,' 'proceed,' and 'recede.' It entered English via Old French in the medieval period, already carrying the weight of thrones and inheritances.

royal speed
British monarchy succession is instant, no gap
named risk
Designated heirs often get killed first
chemistry too
Decay products are called daughter and successor nuclides
function world
Math uses a successor function to define counting
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