The Prefix ad-

acclaim

adopt

affixed

aggravate

allocated

allure
annotated

appraise

approximate
assortment

Key Concepts

• The prefix ad- means “to” or “toward.”
  • ad + join = adjoin
• Sometimes this prefix changes to make words easier to pronounce. You might see the same ad prefix spelled ac, af, ag, al, an, ap, as, or at.
• This change may create words with double consonants, as noted in the word list above.