Denshi Jisho — Online Japanese dictionary

勢 せい 1: energy;
2: military strength
Noun 
勢 ぜい groups engaged in some activity (players, companies, forces, etc.)
Suffix 
勢子 せこ beater (on a hunt)
Noun 
勢 はずみ 1: bounce; spring; rebound;
2: momentum; inertia;
3: spur of the moment; impulse
Noun 
勢み はずみ 1: bounce; spring; rebound;
2: momentum; inertia;
3: spur of the moment; impulse
Common word, Noun 
勢威 せいい force; power; influence
Noun 
勢家 せいか influential family; the man in power
Noun 
勢む はずむ to spring; to bound; to bounce; to be stimulated; to be encouraged; to get lively; to treat oneself to; to splurge on
Godan verb with mu ending, Intransitive verb 
勢 いきおい 1: force; vigor; vigour; energy; spirit; life;
2: influence; authority; power; might;
3: impetus; momentum; course (of events);
4: (Adverbial noun) naturally; necessarily
Irregular okurigana usage, Adverb, Noun 
勢い いきおい 1: force; vigor; vigour; energy; spirit; life;
2: influence; authority; power; might;
3: impetus; momentum; course (of events);
4: (Adverbial noun) naturally; necessarily
Common word, Adverb, Noun 
勢運 せいうん trend; tendency
Noun 
勢望 せいぼう power and popularity
Noun 
勢門 せいもん influential family; the man in power
Noun 
勢力 せいりょく influence; power; might; strength; potency; force; energy
Common word, Noun 
勢揃 せいぞろい array; muster; line-up; full force
Irregular okurigana usage, Noun, Suru verb 
勢揃い せいぞろい array; muster; line-up; full force
Noun, Suru verb 
勢ぞろい せいぞろい array; muster; line-up; full force
Noun, Suru verb 
勢車 はずみぐるま flywheel
Noun 
勢力家 せいりょくか man of influence
Noun 
勢力家 せいりょっか man of influence
Noun 
勢み車 はずみぐるま flywheel
Noun 
勢い込む いきおいこむ to brace oneself
Godan verb with mu ending, Intransitive verb 
勢いづく いきおいづく to gather strength; to take heart
Godan verb with ku ending, Intransitive verb 
勢い付く いきおいづく to gather strength; to take heart
Godan verb with ku ending, Intransitive verb 
勢い良く いきおいよく vigorously
Adverb 
勢至菩薩 せいしぼさつ Mahasthamaprapta (bodhisattva)
Noun, Buddhist term 
勢力圏 せいりょくけん sphere of influence
Noun 
勢力下に せいりょくかに under the influence of
Adverb 
勢力範囲 せいりょくはんい sphere of influence
Noun 
勢力分野 せいりょくぶんや the respective (relative) strength of political parties; distribution of the number of parliamentary seats held by each of the political parties
Noun 
勢いを振るう いきおいをふるう to wield power; to exercise authority
Expression, Godan verb with u ending 
勢力拡大 せいりょくかくだい expansion of one's sphere of influence; increase in one's power (strength, influence)
Noun 
勢力関係 せいりょくかんけい power relations; balance of power (between)
Noun 
勢力拮抗 せいりょくきっこう struggle for supremacy between evenly-matched forces (parties)
Noun, Suru verb 
勢力均衡 せいりょくきんこう balance of power
Noun 
勢力圏内 せいりょくけんない within the sphere of influence (of)
Noun 
勢力伯仲 せいりょくはくちゅう (the two sides) being evenly-matched in influence or power
Noun 

Found 37 words.

You can also

Look up kanji details for 勢 いきおい.

Try a Yahoo Jisho search for 勢 いきおい .
Try a Goo Jisho search for 勢 いきおい .
Try a Google search for 勢 いきおい .