解する|かいするkaisuru[3]nakadaka (mid-high)

1. suru verb (irregular), transitive verbto understand; to appreciate
   ユーモアを解かいする心こころは、国民性こくみんせいと密接みっせつに結むすびついているが、その結むすびつき方かたは不思議ふしぎである。↗

   The sense of humor is mysteriously bound up with national characteristics.
2. suru verb (irregular), transitive verbto interpret
   私は彼かれの言葉ことばを脅迫きょうはくと解かいした。↗

   I interpreted his remark as a threat.

• SynonymわかるNeutralThe everyday word for 'getting it' — the most colloquial of this group. 「解する」 is written style, seen mostly in set phrases like 「ユーモアを解する」.
• Synonym了解りょうかいNeutralUnderstanding plus acceptance; very common as a reply, as in 「了解です」. 「解する」 is never used to answer someone.
• Synonym理解りかいNeutralThe most common Sino-Japanese word for understanding; covers both knowledge and consideration for others. 「解する」 is the more literary choice.
• Synonym会得えとくWrittenWritten word for taking something in and making it your own — mastering the essentials. Typically used of skills and principles.
• Synonym把握はあくNeutralGetting a firm grasp of the overall picture; very common at work, as in 「状況を把握する」.
• Synonym領得りょうとくWrittenExtremely literary 'comprehend'. In legal usage it also means taking another's property for oneself or a third party; not used in daily speech.
• Related汲み取るくみとるNeutralReads between the lines: sensing another person's feelings or intentions by inference, rather than simply understanding a fact.
• Related読み取るよみとるNeutralDraws meaning out of written text or facial expressions; also used for machines reading data.
• Related飲み込むのみこむNeutralLiterally 'to swallow'; by extension it means catching on or getting the point. Colloquial in this sense.
• Related解釈かいしゃくNeutralInterpreting meaning through your own judgment — the emphasis is on how you read something. 「解する」 shares this interpretive sense.
• Related納得なっとくNeutralBeing convinced and accepting something as reasonable. The focus is on acceptance, not just understanding.
• Related受け取るうけとるNeutralLiterally 'to receive'; by extension, to take someone's words or behavior in a certain way, i.e. interpret them.
• Related捉えるとらえるNeutralGrasps the key point or captures features; leans written, and stresses seizing hold of something rather than understanding it.
• Related読解どっかいNeutralReading comprehension — strictly about reading texts, so its range is narrower than 「解する」.
• RelatedつかむNeutralLiterally 'to grab'; by extension, getting the knack of something or winning people's hearts. Colloquial.
• Related解せるげせるNeutralMeans being able to understand; most often seen in the negative 「解せない」, for something you just cannot make sense of.
• Related掴み取るつかみとるNeutralTo snatch and take — by extension, winning something through your own effort. Not centered on understanding.
• Antonym誤解するNeutralAntonym: to misunderstand — the opposite of the appreciation and understanding that 「解する」 expresses.

For everyday 'I get it', use 「分かる」 or 「理解する」; 「解する」 is written style, best known from 「ユーモアを解する」. Use 「読み取る」 for reading meaning out of text or expressions, and 「把握」 for grasping a situation, as in 「状況を把握する」. 「了解」 works as a reply, 「納得」 adds acceptance, and 「解せない」 flags something you cannot make sense of. Words like 「汲み取る」「受け取る」「捉える」 cover inferring or taking things a certain way, while 「誤解する」 is the opposite: to misunderstand.

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

1. 理解りかいする。分わかる。
2. 解釈かいしゃくする。特定とくていの形かたちで理解りかいする。受け止うけとめる。