THESAURUS
preemption
adoption, appropriation, arrogation, assumption, colonization, conquest, emption, enslavement, first option, first refusal, indent, occupation, option, preoccupation, prepossession, refusal, requisition, right of emption, right of
preemption, subjugation, takeover, taking over, usurpation
ROGET THESAURUS
preemption
Purchase
N
purchase, emption, buying, purchasing, shopping,
preemption, refusal, coemption, bribery, slave trade, buyer, purchaser, emptor, vendee, patron, employer, client, customer, clientele, purchased, caveat emptor, the customer is always right.