名詞 ad-:

1. a public promotion of some product or service
   同義詞：ad, advertisement, advertizement, advertising, advertizing, advert

副詞 ad-:

1. in the Christian era; used before dates after the supposed year Christ was born
   同義詞：AD, A.D., anno Domini

Important derivatives are: at aid
重要派生詞為： at aid
To, near, at.
朝向, 接近, 在.

ado , at , from Old English ôt , near, by, at, and from Middle English at , .to,. from Old Norse at , both from Germanic *at .
ado , at , 源自 古英語 ôt , 接近, 經(jīng)過, 在, 并且源自 中古英語 at , .向,. 源自 古斯堪的納維亞語 at , 兩者都源自 日耳曼語 *at .
ad- , -ad ; ( adjuvant ), aid , amount , ( paramount ), from Latin ad , ad- , to, toward.
ad- , -ad ; ( adjuvant ), aid , amount , ( paramount ), 源自 拉丁語 ad , ad- , 朝向, 向.
來源：
Pokorny .ad- 3.
波科爾尼 .ad- 3.