Definition of Al

AL or Al may refer to:

• Accursed Lands (MUD)
• AL (automobile)
• Alman Lisesi, a high school in Istanbul also known as Deutsche Schule Istanbul
• Almanor Railroad
• The American League in Major League Baseball
• Anno Lucis (AL), a Masonic calendar system
• Apache License
• Arab League
• Asia League Ice Hockey
• Liber AL
• Skyway Airlines IATA airline code (AL)
• TransAVIAexport Airlines IATA airline code (AL)
• The Arabic prefix Al-
• Aluminium
• An abbreviation for the name Alex, Alexander, Albert, Alfred or Alan.

.al is the Internet country code top-level domain (ccTLD) for Albania. It is administered by the Telecommunications Regulatory Authority of Albania.

The suffix -al is the IUPAC nomenclature used in organic chemistry to form names of aldehydes containing the -(CO)H group. It was extracted from the word "aldehyde".

Ål is a municipality in the county of Buskerud, Norway.

(, also transliterated as el- and in some cases il- and ul-) is a  prefix in the Arabic language which functions as a definite article, comparable to the English word . However, al- never stands as a word by itself, but is always joined to the beginning of the word it modifies — for example, 'the book' is al-kitāb, which is written . Like the English word 'the', al- is not a permanent component of words it is attached to; it is only prefixed to a word to make the word definite — continuing the example, 'a book', or simply 'book', is kitāb, which is written , as Arabic does not have an indefinite article. Unlike English usage, Arabic grammar  requires al- to be used with adjectives modifying the definite noun. For example, 'the big book' in English requires only one instance of 'the', but in Arabic the phrase is al-kitāb al-kabīr, written , with two instances of al- (DEF-book-DEF-big, literally, 'the book the big'). Hebrew, another language in the Semitic family, has similar rules for the use of its definite article.