AB, Ab, or ab may refer to:
Abraham Lincoln (/ˈeɪbrəhæm ˈlɪŋkən/; February 12, 1809 – April 15, 1865) was an American politician and lawyer who served as the 16th President of the United States from March 1861 until his assassination in April 1865. Lincoln led the United States through its Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis.
Abortion is the ending of pregnancy by removing a fetus or embryo before it can survive outside the uterus.
Livy's History of Rome, sometimes referred to as Ab Urbe Condita, is a monumental history of ancient Rome, written in Latin, between 27 and 9 BC.
Abu Dhabi (US /ˈɑːbuː ˈdɑːbi/, UK /ˈæbuː ˈdɑːbi/; Arabic: أبو ظبي Abū Ẓabī Emirati pronunciation [ɐˈbuˈðˤɑbi]) is the capital and the second most populous city of the United Arab Emirates (the most populous being Dubai), and also capital of the Emirate of Abu Dhabi, the largest of the UAE's seven emirates.
Abraham (Avraham) (/ˈeɪbrəˌhæm, -həm/ ABE-raham; Hebrew: אַבְרָהָם, listen ), originally Abram, is the first of the three patriarchs of Judaism.
ABBA (stylised ᗅᗺᗷᗅ; Swedish pronunciation: [²abːa]) are a Swedish pop group formed in Stockholm in 1972 by Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad.
The Abbasid Caliphate (/əˈbæsᵻd/ or /ˈæbəsᵻd/ Arabic: الخلافة العباسية al-Khilāfah al-‘Abbāsīyah) was the third of the Islamic caliphates to succeed the Islamic prophet Muhammad.
Abiogenesis (Brit.: /ˌeɪˌbaɪoʊˈdʒɛnᵻsᵻs, -ˌbaɪə-, -ˌbiːoʊ-, -ˌbiːə-/ AY-by-oh-JEN-ə-siss or AY-bee-oh-JEN-ə-siss), biopoiesis, or informally, the origin of life, is the natural process by which life arises from non-living matter, such as simple organic compounds.
Abrahamic religions, emphasizing and tracing their common origin to the tribal patriarch Abraham or recognizing a spiritual tradition identified with him, are one of the major divisions in comparative religion (along with Indian, Iranian, and East Asian religions).