ad lib

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Also see: lib

Multiple Entries:
  ad    AD    -ad    ad-  

Concise Oxford English Dictionary © 2008 Oxford University Press:
ad/ad/

▶noun informal

• 1 an advertisement.

• 2 Tennis advantage.

Concise Oxford English Dictionary © 2008 Oxford University Press:
AD/eɪˈdiː/

▶abbreviation Anno Domini (used to indicate that a date comes the specified number of years after the traditional date of Christ's birth).

usage: ad should be placed before the numerals, as in ad 375 (not 375 ad). The reason for this is that ad is an abbreviation of Latin anno domini, which means ‘in the year of our Lord’. However, when the date is spelled out, it is normal to write the third century ad (not ad the third century). Compare with BC.

Concise Oxford English Dictionary © 2008 Oxford University Press:
-ad1 /ad, əd/

▶suffix forming nouns.

• 1 in collective numerals: myriad.

• 2 in names of females in classical mythology: dryad.

• 3 in names of poems and similar compositions: Iliad.

• 4 forming names of members of some taxonomic groupings: bromeliad.

– origin from the Gk ending -as, -ad-.

Concise Oxford English Dictionary © 2008 Oxford University Press:
-ad2 /əd/

▶suffix forming nouns such as ballad, salad. Compare with -ade2.

– origin from Fr. -ade.

Concise Oxford English Dictionary © 2008 Oxford University Press:
ad- /ad/ (also 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)

▶prefix

• 1 denoting motion or direction to: advance.

• 2 denoting reduction or change into: adulterate.

• 3 denoting addition or increase: adjunct.

– origin from L. ad ‘to’.