rectus

adsumo – appropriate, call, claim, to take to oneself
appositus – appositively, approaching, appropriate, placed near
apto – approve, be suitable, fit, proper, to fit
aptus – appropriate, connected, fastened, fitted, fitted out, fitting, prepared, qualified, suitable
beneficium – benefit, boon, bribe, favor, gift, pious donation, privilege, reward, right, service, wages
campus – field, level place, plain
canonicus – according to the canons, canonical, lawful, legal, right
commodus – commodious, fit, proper, useful, welcome
congruens – appropriate, proportioned
congruus – agreeing, appropriate, fit, suitable

rector – director, guider, leader, master, ruler
rectum – direct, govern, right, to guide, to rule, virtue
directus – direct, open, plain, simple, straightforward
erectus – alert, anxious, cheerful, proud, resolute, standing, upright
incorrectus – not emended, uncorrected, unimproved
actus – moving through
aestus – passionate fire
altus – ancient, deep, great, high, matured, noble, old, secret
aptus – appropriate, connected, fastened, fitted, fitted out, fitting, prepared, qualified, suitable
artus – limbs

rec·tus[1]