词根：-vac-, -vacu-, -van-, -void-

【词根含义】：空

【词根来源】：-vac-来源于拉丁语动词vac.o, vac.are, vac.avi, vac.atum(空);-vacu-来源于拉丁语动词vacuo, -are, -avi, -atus(使空); -van-来源于拉丁语形容词van.us, van.a, van.um(空);-void-来源于古法语vuide(空的)。均可追溯至原始印欧语wan-(缺乏的)。

【同源单词】：vacancy, vacant, vacate, vacation, vacationist

前缀：a-

【词根含义】：在,到;来,临近;离开;否定;副词前缀;加强意义

【词根来源】：来源于古英语和中古英语a-, an, on。

【同源单词】：aboard, abroad, acentric, across, ago

词根词缀：-ance, -ancy

【来源及含义】Latin: often through French, quality or state of; being; condition; act or fact of _______ ing; a suffix that forms nouns

【同源单词】aberrance, absorbance, absorptance, abundance, acceptance, accordance