名詞 dilatation:

1. the state of being stretched beyond normal dimensions
   同義詞：distension, distention
2. the act of expanding an aperture
   同義詞：dilation

dil.a.ta.tion

n.（名詞）

The act or process of expanding; dilation.
膨脹：擴張的行為或過程；擴張法
The condition of being expanded or stretched.
擴大：擴大或延伸的狀況
A dilated formation or part.
膨脹：膨脹的形狀或部分
Medicine The condition of being abnormally enlarged or dilated, as of an organ, an orifice, or a tubular structure:
【醫(yī)學】 擴張（癥）：不正常擴大或擴張的情況，比如器官、體腔開口或管狀結(jié)構(gòu)的擴張：
例句：
dilatation of the stomach.Also called dilation
胃脹也作 dilation

Lengthy explanation or elaboration of a subject in writing or speech.
鋪張，評述：作品或講話中長篇大論或某一論題的詳盡闡述

【引伸】
dil.ata.tional
adj.（形容詞）