名詞 million:

1. the number that is represented as a one followed by 6 zeros
   同義詞：1000000, one thousand thousand, meg
2. a very large indefinite number (usually hyperbole)
   同義詞：billion, trillion, zillion, jillion

形容詞 million:

1. (in Roman numerals, M written with a macron over it) denoting a quantity consisting of 1,000,000 items or units

1. It is estimated that the damage was over one million dollars.
   據估計，損失超過了一百萬元。
2. They estimated the number of visitors at 10 million.
   他們估計參觀者人數為1000萬。
3. The old man left an estate of two million dollars when he died.
   那老人去世時留下二百萬美元的遺產。
4. The record was a big hit and sold a million copies.
   這張唱片非常成功，賣了一百萬張。
5. There were millions of people in the square.
   廣場上有好多好多人。

mil.lion

n.（名詞）
【復數】 million 或 mil.lions
The cardinal number equal to 0'.
一百萬：基數，等于0'
A million monetary units, such as dollars:
百萬元：百萬級貨幣單位，如美元：
例句：
made a million in the stock market.
在股票市場賺了一百萬

Often millions An indefinitely large number:
常作 millions 無數：無限的極大數：
例句：
millions of bicycles on the road.
路上有無數自行車

Often millions The common people; the masses:
常作 millions 大眾：普通老百姓；群眾：
例句：
entertainment for the millions.
大眾娛樂

來源：
Middle English
中古英語
from Old French milion
源自 古法語 milion
probably from Old Italian milione [augmentative of] mille [thousand]
可能源自 古意大利語 milione [] mille的增義成分 [千]
from Latin molle * see gheslo-
源自 拉丁語 molle *參見 gheslo-

【引伸】
mil.lion
adj.（形容詞）