dil·a·ta·tion
noun/ˌdaɪləˈteɪʃn/, /ˌdɪləˈteɪʃn/
/ˌdaɪləˈteɪʃn/, /ˌdɪləˈteɪʃn/
[uncountable] (medical)- the process of becoming wider (= of becoming dilated), or the action of making something become wider
扩张；扩大；膨胀 Word Originlate Middle English: via Old French from late Latin dilatatio(n-), from the verb dilatare ‘spread out’, from di- ‘apart’ + latus ‘wide’.