What is another word for "ultra"?

Roget's Thesaurus (1911) lists these synonyms for "ultra": and, backwoods, beyond, boundary, bourn, but, circumvallation, confine, conterminable, conterminate, curbstone, definite, demarcation, enclave, far, frontier, further, landmark, limit, line, pale, plus, point, precinct, reservation, sluice, stick, stint, term, terminal, termination, terminus, the, thus, turning, verge.