Below are possible answers for the crossword clue Preliminary preparation.
10 letter answer(s) to preliminary preparation
GROUNDWORK
lowest support of a structure;
preliminary preparation as a basis or foundation; "we are prepared today because of groundwork that was done ten years ago"
the fundamental assumptions from which something is begun or developed or calculated or explained; "the whole argument rested on a basis of conjecture"
9 letter answer(s) to preliminary preparation
SPADEWORK
dull or routine preliminary work preparing for an undertaking
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