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challenge ['ʧælɪnʤ] n
gen.	課題 ichi1 news1 nf01; 忌避 news2 nf28 spec2 (きひ); 呼び止める news2 nf42; 呼び留める; 仕掛ける news1 nf24 (しかける); 仕かける; 申し込む ichi1 news2 nf39; 申込む; 挑む news2 nf46 spec2; 命題 news1 nf17 (meidai); 咎める ichi1; 仕掛け news1 nf08 (しかけ); 仕掛 (しかけ); 相手取る news1 nf11 (esp. in a lawsuit)
law	忌避する (裁判官を忌避する; challenge the judge) Japanese Law Translation Database System
n challenge | n n
gen.	難題 news1 nf13; 申し込み ichi1 news1 nf04 (もうしこみ); 申込み ichi1 (もうしこみ); 申込 ichi1; 臨み
n vs challenge | n vs n
gen.	挑戦 ichi1 news1 nf03; 肉薄 news1 nf24; 肉迫
English thesaurus
challenge ['ʧælɪnʤ] n
law	to make a formal objection to the qualifications of a potential jury or juror; Someone's right to object to or fight something in a legal case
mil., abbr.	chal
mil., logist.	Act of ascertaining the nature of a detected person, object or phenomenon and possibly even their nature or type. (FRA); Any process carried out by one unit or person with the object of ascertaining the friendly or hostile character or identity of another. (FRA)