• 約やく

  approximately, about

• 約款やっかん

  agreement, stipulation, article, clause

• 約束やくそく

  promise, agreement, arrangement, one's word, contract, pact

• 集約しゅうやく

  putting together (e.g. opinions), gathering, collecting, aggregating, summarizing, integrating

• 倹約けんやく

  thrift, economy, frugality

• 契約けいやく

  contract, compact, agreement

• 予約よやく

  reservation, appointment, booking, advance order

• 公約こうやく

  public commitment, public promise, campaign pledge, official vow

• 締約ていやく

  conclusion of a treaty

• 制約せいやく

  limitation, restriction, condition, constraints

• 要約ようやく

  summary, digest

• 条約じょうやく

  treaty, pact, convention, agreement

• 解約かいやく

  cancellation of a contract

• 盟約めいやく

  oath, pledge, pact, covenant, alliance

• 節約せつやく

  economising, saving

• 婚約こんやく

  engagement, betrothal

• 誓約せいやく

  oath, vow, pledge, covenant

• 特約とくやく

  special contract, special agreement, rider (insurance)

• 密約みつやく

  secret agreement

• 確約かくやく

  firm promise, definite promise

• 規約きやく

  agreement, rules, code, protocol, convention, bylaw

• 旧約きゅうやく

  old promise, old agreement, old covenant

• 成約せいやく

  conclusion of a contract

• 契約書けいやくしょ

  (written) contract, agreement

• 婚約者こんやくしゃ

  fiance, fiancee

• 約束通りやくそくどおり

  as promised

• 予約注文よやくちゅうもん

  pre-order, advance order

• 約手やくて

  promissory note

• 約諾やくだく

  agreement, promise

• 約数やくすう

  divisor, factor, measure

• 約音やくおん

  contraction (in phonetics)

• 約転やくてん

  contraction (in phonetics)

• 約定やくじょう

  agreement, stipulation, contract

• 約言やくげん

  summary, contraction, verbal agreement

• 約分やくぶん

  reduction (of a fraction to its lowest terms)

• 約物やくもの

  punctuation marks and other special symbols

• 約因やくいん

  consideration (in contract law, the thing given or done by the promisee in exchange for the promise)

• 棄約きやく

  breaking a promise

• 既約きやく

  irreducible

• 黙約もくやく

  tacit agreement, default

• 簡約かんやく

  simplification, abbreviation, abridgment, condensation

• 協約きょうやく

  pact, convention, agreement

• 新約しんやく

  new contract, new agreement

• 信約しんやく

  vow, promise

• 破約はやく

  breaking (an agreement, promise), cancellation (of a contract)

• 縮約しゅくやく

  abridgment, abridgement, condensation

• 売約ばいやく

  sales contract

• 先約せんやく

  previous engagement, prior contract

• 内約ないやく

  (marriage) engagement, secret treaty, tacit understanding, private contract

• 違約いやく

  breach of contract, default