Englishfor English speakers
a
Determinative
—
A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
—
A is the first letter of the alphabet.
The letter "a" comes before "b".
—
In some schools, an A is a very high grade.
Ron got an A on his earth science test.
casa
noun
—
(slang) house
Casa
properNoun
—
A town in Arkansas.
per
Preposition
—
for each; during each
Double rooms with full breakfast are £40 per person per night.
LE
—
noun
(= lupus erythematosus)
a chronic inflammatory collagen disease affecting connective tissue (skin or joints)