assurancen.
英 ə'ʃʊər(ə)ns | 美 ə'ʃʊrəns
中文n. 保证，担保；（人寿）保险；确信；断言；厚脸皮，无耻
词根词源
assurance (n.)late 14c., "formal or solemn pledge, promise," also "certainty," from Old French asseurance (11c., Modern French assurance) "assurance, promise; truce; certainty, safety, security," from asseurer (see assure). The word had a negative tinge 18c., often suggesting impudence or presumption.
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