preparatory
/ˈpɹɛp(ə)ɹətɔɹi/ adjective C1- Of or pertaining to preparation, having the purpose of making something or someone ready, preparative. · I will conduct some preparatory research before choosing the new restaurant's location.
From the library
Matthew encountered the stationmaster locking up the ticket office preparatory to going home for supper, and asked him if the five-thirty train would soon be along.
There were slates and bricks piled up on the roof preparatory to some repairs, and they would have me believe that the wind had toppled over one of these.
“I once thought,” continued Faria, “of removing these iron bars, and letting myself down from the window, which, as you see, is somewhat wider than yours, although I should have enlarged it still more preparatory to my flight; however, I discovered that I should merely have dropped into a sort of inner court, and I therefore renounced the project altogether as too full of risk and danger.
Lucien had found time, preparatory to the count’s arrival, to relate many particulars respecting him to Madame Danglars.
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