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preparatory

preparatory /prɪˈperəˌtori/ Brit /prɪˈpærətri/ adjective
preparatory
/prɪˈperəˌtori/ Brit /prɪˈpærətri/
adjective
Britannica Dictionary definition of PREPARATORY
always used before a noun
: used or done to prepare for something

preparatory to

formal
: as a way of becoming ready for (something) : in preparation for (something)