会する|かいするkaisuru[3]nakadaka (mid-high)

1. suru verb (irregular), intransitive verbto meet; to assemble; to gather
2. suru verb (irregular), intransitive verbto encounter; to run into

• SynonymあうNeutralThe most general word for meeting or running into someone. 「会する」 is written style, seen mostly in set phrases like 「一堂に会する」.
• Synonym出会うであうNeutralCovers chance encounters and first-time meetings. 「会する」 usually means people gathering for some purpose.
• Synonym集まるあつまるNeutralThe everyday, all-purpose word for people gathering. 「会する」 is written style and stresses assembling in one place for a purpose.
• Synonym出くわすでくわすCasualColloquial for bumping into someone or something by chance. 「会する」 meetings are usually purposeful.
• Synonym会合かいごうNeutralA noun for a gathering held to discuss something. 「会する」 is a verb, typically in 「一堂に会する」.
• Synonym集会しゅうかいNeutralMany people assembling for a shared purpose, such as a political rally. 「会する」 can cover a small group meeting.
• Synonym合うあうNeutralVery broad: things fitting, matching or coming together. 「会する」 is for people assembling or rivers converging, and leans written.
• Synonym集合しゅうごうNeutralPeople or things gathering at one spot, often an arranged meetup like 「駅前に集合」. 「会する」 is written, usually 「一堂に会する」.
• Synonym面会めんかいFormalFormal face-to-face visiting, especially at hospitals or prisons. 「会する」 means assembling in one place.
• Synonymめぐり合うめぐりあうWrittenWritten style for a chance meeting after long separation or a long search, with a wistful feel. 「会する」 mostly means assembling, without that emotional color.
• Synonym集うつどうWrittenLiterary word for like-minded people gathering. Close to 「会する」 but with a softer feel.
• Synonym参集さんしゅうFormalFormal term for coming to assemble somewhere, common in official notices. 「会する」 stresses being gathered in one place.
• Synonym寄り集まるよりあつまるNeutralMany people or things clustering together. 「会する」 implies a purpose and is more formal.
• Synonym落ち合うおちあうNeutralMeeting up at an arranged spot; also said of rivers joining. 「会する」 usually refers to a group gathering.
• Synonym出会いであいNeutralA noun for an encounter or first meeting, often with a sense of fate. 「会する」 is a verb for assembling.
• Synonym対面たいめんNeutralMeeting face to face, often a first meeting or a reunion after a long time. 「会する」 is about many people gathering.
• Synonym際会さいかいWrittenWritten style for encountering an occasion or event, as in 「好機に際会する」; can also mean meeting people. 「会する」 is mostly people gathering.
• Synonym集結しゅうけつWrittenMassing of troops or forces in one place. 「会する」 is people gathering, with no military force nuance.
• Synonymお目にかかるおめにかかるFormalA humble way to say 「会う」 when meeting someone you respect. 「会する」 carries no honorific nuance.
• Synonym会わすあわすCasualTransitive: to have people meet, or to put someone through something, as in 「ひどい目に会わす」. 「会する」 is intransitive.
• Synonym会同かいどうWrittenWritten and rare: assembling for a meeting, as of diplomats. For the verb sense, everyday speech uses 「集まる」.
• Synonym顔を合わせるかおをあわせるNeutralIdiom for meeting face to face; also co-starring or facing off in a contest. 「会する」 is more formal.
• Antonym散るちるNeutralTo scatter or disperse; also said of falling blossoms. Opposite of 「会する」 in the sense of assembling versus dispersing.
• Antonym別れるわかれるNeutralTo part from people or break up. The opposite of 「会する」 when it comes to people coming together versus parting.

For everyday meeting use 「会う」 and for gathering use 「集まる」; 「会する」 itself is written style, mostly in 「一堂に会する」, and official notices ask people to 「参集」. Chance meetings are 「出会う」 or colloquial 「出くわす」, humble 「お目にかかる」, arranged meetups 「落ち合う」 or 「集合」, hospital or prison visits 「面会」, and literary gatherings 「集う」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 一定いっていの目的もくてきをもって人ひとが集あつまる。