開かい会かい

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Common wordJLPTN2Freq.FrequencyTop 20,000

開会する · noun or participle which takes 'suru'

Meanings

opening of a meeting; convening

Used for formal gatherings such as conferences, assemblies, or court sessions. Often appears in official announcements.

〈事こと〉が開かい会かいするfor a meeting/session to open or convene
会かい議ぎは午ご前ぜん十じゅう時じに開かい会かいした。
The conference convened at ten in the morning.
〈事こと〉の開かい会かいを宣せん言げんするto formally declare a meeting open
議ぎ長ちょうは総そう会かいの開かい会かいを宣せん言げんした。
The chairperson declared the general meeting open.

開会 can be used both transitively and intransitively: 議長が会議を開会する (the chair opens the meeting) and 会議が開会する (the meeting opens).

開かい催さいN1
開催 means to hold or organize an event (broader, covering the whole event), whereas 開会 refers narrowly to the formal moment a meeting begins.

閉へい会かいN2
閉会 means the closing of a meeting, the direct opposite of 開会, which means its opening.
散さん会かい
開会 means a meeting opening or starting, the direct opposite of 散会, which means it breaking up and ending.

開かい幕まくN1
開幕 refers to the opening of a performance, exhibition, or sporting event, while 開会 is used specifically for the start of a formal meeting or assembly.

Compound of 開 (kai, 'open') and 会 (kai, 'meeting'). The reading is on'yomi.