Definition of Ad-

Webster's Revised Unabridged Dictionary (1913)
Ad-
As a prefix ad- assumes the forms ac-, af-, ag-, al-, an-, ap-, ar-, as-, at-, assimilating the d with the first letter of the word to which ad- is prefixed. It remains unchanged before vowels, and before d, h, j, m, v. Examples: adduce, adhere, adjacent, admit, advent, accord, affect, aggregate, allude, annex, appear, etc. It becomes ac- before qu, as in acquiesce.

  

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Ad- definition was found in categories: Language, Idioms & Slang(1)  Encyclopedia(1)  

Ad- Definition from Language, Idioms & Slang Dictionaries & Glossaries

hEnglish - advanced version
ad-

ad-
\ad-\ (&?;). [a latin preposition, signifying to. see at.] as a prefix ad- assumes the forms ac-, af-, ag-, al-, an-, ap-, ar-, as-, at-, assimilating the d with the first letter of the word to which ad- is prefixed. it remains unchanged before vowels, and before d, h, j, m, v. examples: adduce, adhere, adjacent, admit, advent, accord, affect, aggregate, allude, annex, appear, etc. it becomes ac- before qu, as in acquiesce.



Ad- Definition from Encyclopedia Dictionaries & Glossaries

Wikipedia English - The Free Encyclopedia
Ad-
ad- is an English prefix. It was both a prefix and a preposition in Latin meaning "toward, to, near, at." As a prefix, the consonant (d) became assimilated to the initial consonant of the verb that it attached to.

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