Denshi Jisho — Online Japanese dictionary

一国 いっこく 1: whole country;
2: hotheaded; stubborn
Common word, Na-adjective, Adverbial noun, Temporal noun 
一切 いっさい all; everything; without exception; the whole; entirely; absolutely
Common word, Adverbial noun, Noun 
一式 いっしき complete set; all; everything
Common word, Noun 
一室 いっしつ one room
Common word, Noun, No-adjective 
一種 いっしゅ species; kind; variety
Common word, Adverb, Noun 
一首 いっしゅ tanka; poem
Common word, Adverbial noun, Temporal noun 
一緒 いっしょ 1: together;
2: at the same time;
3: same; identical
Common word, Adverbial noun, Noun, No-adjective 
一審 いっしん first instance; first trial
Common word, Noun 
一心 いっしん 1: one mind;
2: wholeheartedness; one's whole heart
Common word, Adverb, Noun 
一新 いっしん complete change; reform; restoration; remodeling; remodelling; renewal
Common word, Noun, Suru verb 
一身 いっしん oneself; one's own interests; throughout the body
Common word, Noun 
一世 いっせい a lifetime; a generation; foreign immigrant; Japanese immigrant to USA
Common word, Noun 
一斉 いっせい simultaneous; all at once
Common word, Adverbial noun, Noun 
一石 いっせき one game (of go)
Common word, Noun 
一節 いっせつ a verse (e.g. in the Bible); stanza; paragraph; passage; a joint; section; a tune; note; strain; measure
Common word, Noun 
一千 いっせん 1,000; one thousand
Common word, Noun 
一戦 いっせん battle; game; bout
Common word, Noun, Suru verb 
一線 いっせん line
Common word, Noun 
一層 いっそう 1:
2: (Usually written using kana alone) much more; still more; all the more; more than ever; () single layer (or storey, etc.);
3: (Adverb) (Archaism) rather; sooner; preferably
Common word, Adverb, No-adjective 
一掃 いっそう clean sweep; purging; doing away with; eradication
Common word, Noun, Suru verb 
一足 いっそく pair (footwear)
Common word, Adverbial noun, Temporal noun 
一体 いったい 1: ...the heck (e.g. "what the heck?"); ...in the world (e.g. "why in the world?"); ...on earth (e.g. "who on earth?");
2: (Noun) one object; one body; unity;
3: one form; one style;
4: one Buddhist image (or carving, etc.);
5: (Adverbial noun) generally; in general
Common word, Adverb 
一帯 いったい region; zone; whole place
Common word, Noun 
一旦 いったん 1:
2: (Usually written using kana alone) once;
3: for a moment; temporarily; (Noun) (Archaism) one morning
Common word, Adverb 
一端 いったん 1: one end; an end;
2: part; fragment
Common word, Noun 
一通 いっつう one copy (of a document); one letter
Common word, Noun 

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