一つ【ひとつ】
one, for one thing, only, (not) even, just (e.g. "just try it"), some kind of, one type of
一部【いちぶ】
one part, one portion, one section, some, one copy (e.g. of a document)
一般【いっぱん】
general, universal, ordinary, average, common, non-celebrity, the same, no different, (just) as if
一方【いっぽう】
one (esp. of two), the other, one way, the other way, one direction, the other direction, one side, the other side, one party, the other party, on the one hand, on the other hand, whereas, although, but at the same time, meanwhile, in turn, just keeps, being inclined to ..., tending to be ..., tending to do ..., continuously ..., just keeps on ...ing, only
一時【いちじ】
one o'clock, once, at one time, formerly, before, for a time, for a while, for the time being, for the present, for the moment, temporarily, a time, one time, once
一番【いちばん】
number one, first, first place, best, most, game, round, bout, as a test, as an experiment, by way of experiment, by way of trial, tentatively, song (e.g. in noh), piece
統一【とういつ】
unity, consolidation, uniformity, unification, compatible
一緒【いっしょ】
together, at the same time, same, identical
一昨年【おととし】
year before last
一人【ひとり】
one person, being alone, being by oneself, being single, being unmarried, by oneself, alone, just, only, simply
一定【いってい】
fixed, settled, constant, definite, uniform, regularized, regularised, defined, standardized, standardised, certain, prescribed
唯一【ゆいいつ】
only, sole, unique
一層【いっそう】
even more, still more, all the more, more than ever, one layer, lowest floor (of a building), rather, sooner, preferably
一度【いちど】
once, one time, on one occasion, temporarily, for a moment, one degree, one tone, one musical interval
一億【いちおく】
100,000,000, one hundred million
一体【いったい】
(what) the heck, (why) in the world, (who) on earth, one object, one body, unity, one form, one style, one Buddhist image (or carving, etc.), generally, in general
一致【いっち】
agreement, accord, correspondence, consistency, coincidence, union, unity, cooperation
一切【いっさい】
all, everything, entirety, the whole, absolutely (not), (not) at all, (none) whatsoever, without exception
同一【どういつ】
identical, same, one and the same, equal, fair, equal treatment, without discrimination
一家【いっか】
a family, a household, a home, one's family, whole family, (one's own) style, school, gang, (yakuza) family