prefix means a fragment that is attached to the beginning of a word, modifying it's meaning. Similarly, the word
prerequisite is a requisite that is needed before the subject of the prerequisite. Is there a word that means "an action that modifies another action and takes place before said action"? Or simply, "an action that you do before (another action)"? For instance:
Picking up a spoon is a (pre-action) of eating soup.
pre-action would be a substitute for the word I'm looking for.
(Bonus if there is a similar word paralleling 'suffix' meaning 'to take an action after (another action)'.)