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約束 / やくそく : n vs 1 1）arrangement 2）promise 3）appointment 4）pact 5）engagement 2 6）convention 7）rule P
約数 / やくすう : n 1）divisor 2）factor 3）measure
約音 / やくおん : n 1）(ling) contraction (in phonetics)
約諾 / やくだく : n vs 1）agreement 2）promise
約言 / やくげん : n vs 1）summary 2）contraction 3）verbal agreement
約物 / やくもの : n 1）punctuation marks and other special symbols (term used in printing)
約款 / やっかん : n 1）agreement 2）stipulation 3）article 4）clause P
約 / やく : adv 1 1）approximately 2）about n 2 3）promise 3 4）shortening 5）reduction 6）simplification 4 7）(ling) contraction (in phonetics) P
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約束

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