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
一般【いっぱん】
general, universal, ordinary, average, common, non-celebrity, the same, no different, (just) as if
統一【とういつ】
unity, consolidation, uniformity, unification, compatible
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
十一【じゅういち】
eleven, 11, jack
一昨年【おととし】
year before last
一緒【いっしょ】
together, at the same time, same, identical
一人【ひとり】
one person, being alone, being by oneself, being single, being unmarried, by oneself, alone, just, only, simply
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
一定【いってい】
fixed, settled, constant, definite, uniform, regularized, regularised, defined, standardized, standardised, certain, prescribed
一回【いっかい】
once, one time, one round, one game, one bout, one heat, one inning
一度【いちど】
once, one time, on one occasion, temporarily, for a moment, one degree, one tone, one musical interval
一気【いっき】
one breath, chug!, drink!
一連【いちれん】
series, chain, sequence, two reams (i.e. 1000 sheets of paper), verse, stanza
一本【いっぽん】
one long cylindrical thing, one film, TV show, etc., one goal, home run, etc., one telephone call, one version, one book, a certain book, ippon, one point, a blow, geisha, single-minded focus on ...
一億【いちおく】
100,000,000, one hundred million