Definition of ad- in English:

ad-

prefixədad

1Denoting motion or direction to.
表示“往”，“向…”
advance
adduce
1. 1.1 Denoting reduction or change into.
  表示“往”，“向…”
  adapt
  adulterate
2. 1.2 Denoting addition, increase, or intensification.
  表示“添加”，“增长”，“加剧”
  adjunct

Usage

Ad- is also found assimilated in the following forms: a- before sc, sp, st; ac- before c, k, q; af- before f; ag- before g; al- before l; an- before n; ap- before p; ar- before r; as- before s; at- before t

Origin

From Latin ad 'to'; in the 16th century the use of ad- and its variants was extended to replace a- from a different origin such as Latin ab- (e.g. advance, from French avancer based on late Latin abante 'in front').

Definition of ad- in US English:

ad-

prefix

1Denoting motion or direction to.
表示“往”，“向…”
advance
adduce
1. 1.1 Reduction or change into.
  表示“减少”，“变成”
  adapt
  adulterate
2. 1.2 Addition, increase, or intensification.
  表示“添加”，“增长”，“加剧”
  adjunct
  adhere
  admixture

Usage

The prefix ad- is also found assimilated in the following forms: a- before sc, sp (ascend, aspire); ac- before c, q (accede, acquire); af- before f (affiliate); ag- before g (aggregate); al- before l (allude); an- before n (annex); ap- before p (appall); ar- before r (arrest); as- before s (assume); at- before t (attend)

Origin

From Latin ad ‘to’; in the 16th century the use of ad- and its variants was extended to replace a- from a different origin such as Latin ab- (e.g. advance, from French avancer based on late Latin abante ‘in front’).

词汇	ad-
释义	Definition of ad- in English: ad- prefixədad 1Denoting motion or direction to. 表示“往”，“向…” advance adduce 1.1 Denoting reduction or change into. 表示“往”，“向…” adapt adulterate 1.2 Denoting addition, increase, or intensification. 表示“添加”，“增长”，“加剧” adjunct Usage Ad- is also found assimilated in the following forms: a- before sc, sp, st; ac- before c, k, q; af- before f; ag- before g; al- before l; an- before n; ap- before p; ar- before r; as- before s; at- before t Origin From Latin ad 'to'; in the 16th century the use of ad- and its variants was extended to replace a- from a different origin such as Latin ab- (e.g. advance, from French avancer based on late Latin abante 'in front'). Definition of ad- in US English: ad- prefix 1Denoting motion or direction to. 表示“往”，“向…” advance adduce 1.1 Reduction or change into. 表示“减少”，“变成” adapt adulterate 1.2 Addition, increase, or intensification. 表示“添加”，“增长”，“加剧” adjunct adhere admixture Usage The prefix ad- is also found assimilated in the following forms: a- before sc, sp (ascend, aspire); ac- before c, q (accede, acquire); af- before f (affiliate); ag- before g (aggregate); al- before l (allude); an- before n (annex); ap- before p (appall); ar- before r (arrest); as- before s (assume); at- before t (attend) Origin From Latin ad ‘to’; in the 16th century the use of ad- and its variants was extended to replace a- from a different origin such as Latin ab- (e.g. advance, from French avancer based on late Latin abante ‘in front’).
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