Denshi Jisho — Online Japanese dictionary

いっさい once or twice; repeatedly
Adverbial noun, Temporal noun 
いっさい one-year-old
Noun 
いっさい one-year-old
Noun 
いっさく one previous
Noun 
いっさく idea; plan
Noun 
いっさつ one copy (e.g. book)
Noun 
いっさつ document; bond
Noun 
いっさん a mountain; a pile (of something)
Noun 
いっしき 1: one color; one colour; one article;
2: same tendency; everyone being caught up in the same thing
Na-adjective, Noun 
いっしつ disadvantage (defect, error)
Noun 
いっしゅ 1: one hand;
2: one's own effort
Noun 
いっしょ one place; the same place
Noun 
いっしょ one letter; one book
Noun 
いっすい current (of water); drop
Noun 
いっすい (usu. in negative sentences) (not) a wink of sleep
Noun, Suru verb 
いっすん 1: one sun (approx. 3.03 cm);
2: a little bit (of time, distance, etc.)
Noun 
いっせい voice; cry; shout
Noun 
いっせき one evening; some evenings
Adverbial noun, Temporal noun 
いっせき sitting; feast; speech
Noun 
いっせき one boat; one ship
Noun 
いっせつ one theory (opinion); another theory (opinion)
Noun 
いっせん thoroughly wash away
Noun, Suru verb 
いっせん one-hundredth of a yen; small amount of money
Noun 
いっせん flash; brandish
Noun, Suru verb 
いっそう pair (esp. of folding screens)
Noun 
いっそう master sergeant (JSDF)
Noun 

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