式|しきshiki[2]odaka (tail-high)

1. noun, noun (suffix)way; style; fashion; method; system; form; type
2. nounceremony; rite; ritual; celebration
   社長しゃちょうの挨拶あいさつが長ながくて式しきの後半こうはんが押せ押おせおせになってしまった。↗

   The company president's welcome was so long that we were squeezed for time in the second half of the ceremony.

   彼かれは事故じこでその式しきに出席しゅっせきできなかった。↗

   An accident prohibited his attending the ceremony.
3. nounwedding (ceremony)
4. nounequation; formula; expression
   式しきに余分よぶんの変数へんすうを加くわえたことによって、この実験じっけん結果けっかは不明瞭ふめいりょうなものになっている。↗

   The result of this experiment is obscured by the extra variables added in the formula.
5. nounenforcement regulations (of the ritsuryō legal codes)

• Synonym儀ぎFormalWritten, formal prose for a ceremony or a matter, mostly in solemn set phrases such as 「〜の儀」.
• Synonym儀式ぎしきNeutralA rite performed by set procedures — religious, celebratory or funerary — stressing the ceremonial process; 「式」 also means methods and formulas.
• Synonym典礼てんれいFormalWritten, formal term for ceremonies and etiquette, or Catholic liturgy; rare in everyday use.
• Related式典しきてんFormalA formal, grand ceremony such as an anniversary commemoration or an opening; 「式」 is broader, also covering weddings, methods and formulas.
• RelatedセレモニーNeutralA loanword for ceremonies and rites, as in 「オープニングセレモニー」; 「式」 is broader, also meaning methods and formulas.
• Related儀典ぎてんFormalFormal term for ceremonial rules and protocol; rare even in writing, found chiefly in diplomatic contexts.

Use 「式」 for everyday ceremonies like weddings and graduations; it also means methods and formulas. For grand formal occasions pick 「式典」, for religious or traditional rites 「儀式」, and 「セレモニー」 for openings or commemorations. 「儀典」「儀」「典礼」 are formal written terms.

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

1. （シキ）儀式ぎしき。
2. （シキ）数式すうしき。
3. （シキ）方式ほうしき。