a

a1
(an before a vowel sound)
determiner
1》 used when mentioning someone or something for the first time; the indefinite article.
    ↘one single: a hundred.
    ↘used when mentioning someone unfamiliar: a Mr Smith telephoned.
    ↘someone like (the name specified).
2》 in, to, or for each; per: petrol prices rose by 3p a litre.
Origin
ME: weak form of OE ān 'one'.
Usage
On the question of using a or an before words beginning with h, see usage at an.
————————
a2
abbreviation
1》 (in travel timetables) arrives.
2》 atto- (10-18).
3》 Brit. (with reference to sporting fixtures) away.
4》 (used before a date) before. [from L. ante.]
symbol (a) Physics acceleration.
————————
a
Physics acceleration.
→ a

English new terms dictionary. 2014.

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.