証文|しょうもんshoumon[0]heiban (flat)

1. nounbond; deed; contract

• Synonym契約書けいやくしょNeutralA written contract; the standard modern word for one. 「証文」 is the old-fashioned word for a written deed, bond or IOU, now heard mostly in set phrases.
• Related約定書やくじょうしょWrittenA document that sets the terms of an agreement down in writing; belongs to written/formal prose and is used less often.

For a modern written contract say 「契約書」; for a loan receipt use 「借用書」. 「証文」 is an old-fashioned deed or IOU-type voucher, now seen mainly in fixed phrases such as 「証文の出し遅れ」.

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

1. 証拠しょうこや証明しょうめいとなる文書ぶんしょ。証書しょうしょ。
2. 論拠ろんきょとなる文書ぶんしょ。