the.com/predisposition

means An inclination or tendency toward something — a vulnerability or leaning that exists in advance, before any particular cause has acted on it.

from Built from Latin prae- ('before') plus disponere ('to arrange, set in order' — from dis-, 'apart,' and ponere, 'to place'). So disposition is literally how your pieces are arranged, your 'placement'; predisposition adds the 'before,' meaning the arrangement was already set prior to the event. The word moved into English via French in general use, then got adopted into medicine and psychology to describe traits or risks laid down ahead of time, waiting for life to call on them.