Word

開始

かいし
start; commencement; beginning; initiation
Word

開発

かいはつ、かいほつ
development; exploitation
Word

開催

かいさい
holding a meeting; open an exhibition
Word

公開

こうかい
opening to the public; making available to the public; putting on display; exhibiting; showing (play, movie, etc.); holding (interview, etc.); open; public
Word

開業

かいぎょう
opening a business; opening a practice
Word

展開

てんかい
development; evolution; progressing; unfolding; expansion; spreading out; extending; deployment; building up
Word

開設

かいせつ
establishment; opening
Word

開く

空く、明く
あく
to open (e.g. doors); to open (e.g. business, etc.); to be empty; to be vacant; to be available; to be free; to be open (e.g. neckline, etc.); to have been opened (of one's eyes, mouth, etc.); to come to an end; to open (one's eyes, mouth, etc.); to have a hole; to form a gap; to have an interval (between events)
Word

開く

ひらく
to open; to undo; to unseal; to unpack; to bloom; to unfold; to spread out; to open (for business, e.g. in the morning); to be wide (gap, etc.); to widen; to hold (meeting, etc.); to give; to open; to found (nation, dynasty, sect, etc.); to open (a new business); to set up; to establish; to start; to open (ports, borders, etc.); to open (an account); to open up (new land, path, etc.); to clear; to develop; to open (a file, etc.); to extract (root); to reduce (equation); to cut open (fish); to change (kanji into hiragana); to flare (e.g. skirt); to slacken (into a poor posture)
Word

開通

かいつう
opening; open; taking effect; becoming active