In addition to the general meaning, the indefinite article may also have other meanings:
1. The use of the indefinite article with an abstract noun meaning of the word reflects the change and transition in the abstract noun concrete.

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Noun science, use without the article, has a value of science (general), but the use of indefinite articles with the word science becomes important branch of science:
Thermodynamics is a science that deals with energy.

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Indefinite article with abstract nouns can be set to indicate a particular quality or a particular kind of concept, designated by a noun.
2. The use of the indefinite article with the noun means a real change of the word and its transition from noun to noun real concrete.
The use of the indefinite article with the name of a real sensitive can also be set to indicate grade, type of substance:
Alloy steel can be defined as steel (= type of steel) to which are added other elements besides carbon.
Indefinite article may have cast a numeric value that reflects the origin of the indefinite article of the numeral one:
You did not say a word (= a word) within two hours.

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Indefinite article is used with a noun expressing a single notion in common.
. Indefinite article is usually used with a noun in the function of the application.
Note. From the noun in the function of the application may be used as definite article and with a view to reinforcing the values ​​expressed by a noun in the application.
. Indefinite article is used with a noun, preceded by the word half:
They were half a mile from Jim's cabin.
Indefinite article is used in the irreducible combinations and rotations: a lot of; a great deal of; to take a fancy to; to be in hurry, and some
others.