assumption

期待(きたい)	An expectation – always good. (I expect that today will be lucky for me! I expect that my students will give 110% effort.)

予想(よそう)	A prediction or forecast – good OR bad. (I predict that third quarter earnings will decline 9%. I predict that my sports team will win 33-21) $$$

前提(ぜんてい)	A presumption (something upon which you predicate your argument) Like, “Your argument against gay marriage presumes that the Christian God exists.”

先入観(せんにゅうかん)	A preconception (that all gaijin steal things!) The meaning of先入観 is closer to ‘prejudice’ or ‘stereotype’ than the other words in this cluster.