A/D

A/D)

● analogue

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ad¹ «ad», noun.

Informal. an advertisement: »

... the breathless, exotic coquetry of the cosmetic ads (Saturday Review).

Usage Ad is the clipped form of advertisement in the United States and Canada, and is also spreading in use in Great Britain; advert is a form used less often in Great Britain.

ad² «ad», noun.

advantage (the first point won in a game of tennis after deuce).

ad-,

prefix.

1. to; toward, as in admit, administer, adverb, advert.

2. at; near, as in adjacent, adrenal. Also: a- before sc, sp, st; ab- before b; 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.

╂[< Latin ad- < ad to, toward, at]

ad.,

advertisement.

a.d.,

Commerce. after date.

AD (no periods),

1. adenoid-degenerating (of a type of respiratory disease).

2. Alzheimer's disease.

A/D,

analogue to digital (conversion in computers).

A.D. or AD (no periods),

since Christ was born; after the birth of Christ: »

Charlemagne was crowned by the Pope in 800 A.D. From A.D. 100 to A.D. 500 is 400 years.

╂[for Late Latin annō Dominī in the year of our Lord]

Usage A.D. might be expected to occur only with a particular year: »

1376 A.D.

It has long been used, however, in the sense “after Christ,” corresponding to B.C., “before Christ”: »

the 5th century A.D.

With a particular year, it often occurs before the figure: »

A.D. 1376.

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Electronics abbr. analog to digital