Denshi Jisho — Online Japanese dictionary

開く あく 1: to open (e.g. doors);
2: to open (e.g. business, etc.);
3: to be empty;
4: to be vacant; to be available; to be free;
5: to be open (e.g. neckline, etc.);
6: to have been opened (of one's eyes, mouth, etc.);
7: to come to an end;
8: () to open (one's eyes, mouth, etc.);
9: () to have a hole; to form a gap; to have an interval (between events)
Common word, Godan verb with ku ending, Intransitive verb 
開花 かいか 1: flowers budding; blooming; flowering;
2: showing results; becoming popular; blooming
Common word, Noun, Suru verb 
開始 かいし start; commencement; beginning; initiation
Common word, Noun, Suru verb 
開示 かいじ disclosure (legal)
Common word, Noun, Suru verb 
開き ひらき 1: opening; gap;
2: (Suffix) dried and opened fish
Common word, Noun 
開く ひらく 1: to open (e.g. a bank-account, festival, etc.);
2: () to spread out; to open up (flower bud, umbrella, etc.); to widen (gap, distance, width);
3: to hold; to give (party, conference, etc.)
Common word, Godan verb with ku ending, Transitive verb 
開化 かいか civilization; civilisation; enlightenment
Noun, Suru verb 
開架 かいか open access (in a library); open shelves
Noun, No-adjective 
開基 かいき 1: foundation of a temple; laying a foundation (stone);
2: (Mathematical term) open base
Noun, Suru verb 
開悟 かいご wisdom; enlightenment
Noun, Suru verb 
開祖 かいそ (sect) founder; apostle; originator; inventor
Noun 
開度 かいど divergence; aperture
Noun 
開ひ かいひ opening a door
Noun, Suru verb 
開扉 かいひ opening a door
Noun, Suru verb 
開炉 かいろ first lighting of the hearth in a Zen temple (first day of the 10th or 11th month)
Noun 
啓く ひらく to enlighten; to edify
Godan verb with ku ending, Archaism 
拓く ひらく to open (e.g. path); to clear (the way); to break up (e.g. land)
Godan verb with ku ending 
開ける あける 1: to open (a door, etc.); to unwrap (e.g. parcel, package);
2: to open (for business, etc.);
3: to empty; to clear out; to make space; to make room;
4: () to dawn; to grow light;
5: to end
Common word, Ichidan verb, Transitive verb 
開演 かいえん curtain raising; starting (e.g. play, concert)
Common word, Noun, Suru verb 
開会 かいかい opening of a meeting
Common word, Noun, Suru verb 
開館 かいかん 1: opening a hall for that day's business (museum, library, such like buildings);
2: opening of new hall (museum, etc.)
Common word, Noun, Suru verb 
開口 かいこう 1: opening; aperture (e.g. camera);
2: opening one's mouth; beginning to speak;
3: (Noun or verb acting prenominally) open; broad
Common word, Noun, Suru verb 
開校 かいこう opening a school
Common word, Noun, Suru verb 
開港 かいこう open port; opening a port
Common word, Noun, Suru verb 
開国 かいこく opening of a country (e.g. Japan) to the world
Common word, Noun, Suru verb 
開墾 かいこん cultivating new land
Common word, Noun, Suru verb 

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