Wiktionary
n. (context legal English) In United States civil procedure, the contact required between a party and a state in order for the courts of that state to constitutionally assert personal jurisdiction over that party.
Wikipedia
Minimum contacts is a term used in the United States law of civil procedure to determine when it is appropriate for a court in one state to assert personal jurisdiction over a defendant from another state. The United States Supreme Court has decided a number of cases that have established and refined the principle that it is unfair for a court to assert jurisdiction over a party unless that party's contacts with the state in which that court sits are such that the party "could reasonably expect to be haled into court" in that state. This jurisdiction must "not offend traditional notions of fair play and substantial justice". A non-resident defendant may have minimum contacts with the forum state if they 1) have direct contact with the state; 2) have a contract with a resident of the state; 3) have placed their product into the stream of commerce such that it reaches the forum state; 4) seek to serve residents of the forum state; 5) have satisfied the Calder effects test; or 6) have a non-passive website viewed within the forum state.