s. bir, herhangi bir. A bicycle has two wheels. (Bir bisikletin iki tekerleği vardır.)

The first letter of the English and of many other alphabets. The
capital A of the alphabets of Middle and Western Europe, as also the
small letter (a), besides the forms in Italic, black letter, etc., are
all descended from the old Latin A, which was borrowed from the Greek
Alpha, of the same form; and this was made from the first letter (/) of
the Phoenician alphabet, the equivalent of the Hebrew Aleph, and itself
from the Egyptian origin. The Aleph was a consonant letter, with a
guttural breath sound that was not an element of Greek articulation;
and the Greeks took it to represent their vowel Alpha with the a sound,
the Phoenician alphabet having no vowel symbols.

An adjective, commonly called the indefinite article, and
signifying one or any, but less emphatically.

In each; to or for each; as, "twenty leagues a day", "a hundred
pounds a year", "a dollar a yard", etc.

In; on; at; by.

In process of; in the act of; into; to; – used with verbal
substantives in -ing which begin with a consonant. This is a shortened
form of the preposition an (which was used before the vowel sound); as
in a hunting, a building, a begging.

Of.

A barbarous corruption of have, of he, and sometimes of it and of
they.

An expletive, void of sense, to fill up the meter