An abode, country, territory, or land where Islamic sovereignty prevails.
In Dar al-Islam, the citizenry abide by the ordinances, rules, edicts, and assembly of Islam. The Muslim state guarantees the safety of life, property, and religious status (only if the religion is not idol-atrous) of minorities (ahl al-dhimma) provided they have submitted to Muslim control.
Dar al-Harb (the abode of war) provides the contrast to Dar al-Islam. Shariʿa (Islamic) law divides the world into these two abodes. Dar al-Harb denotes territory that is not governed by the assembly of Islam, and is directly contiguous to the abode of Islam. Warfare (jihad) can be invoked in order to convert the abode of war into the abode of Islam, or to rescue the bordering abode. Theoretically, an abode of war can extend ad infinitum. Muslim states, in order to avoid conditions requiring constant jihad, yield to the decision of legal experts (ulama), who, based on certain criteria, accept or reject the notion that an area has converted from, or needs to be reconfigured into, Dar al-Islam. These are as follows: (1) the edicts of unbelievers have gained ascendancy; (2) unprotected Muslims and peoples of the book must be rescued; (3) territorial proximity to unbelievers has become repugnant.
Of the above conditions, the first is probably the most important since even if a single edict of Islam is observed, a territory cannot be deemed Dar al-Harb. Further, jihad can be invoked for the sole purpose of turning Dar al-Harb into Dar al-Islam—in other words, to allow for the prevalence of Islamic edicts and the protection of Muslims.
"Dar al-Islam." Encyclopedia of the Modern Middle East and North Africa. . Encyclopedia.com. (July 22, 2018). http://www.encyclopedia.com/humanities/encyclopedias-almanacs-transcripts-and-maps/dar-al-islam
"Dar al-Islam." Encyclopedia of the Modern Middle East and North Africa. . Retrieved July 22, 2018 from Encyclopedia.com: http://www.encyclopedia.com/humanities/encyclopedias-almanacs-transcripts-and-maps/dar-al-islam
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American Psychological Association
"Dār al-Islām." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (July 22, 2018). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/dar-al-islam
"Dār al-Islām." The Concise Oxford Dictionary of World Religions. . Retrieved July 22, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/dar-al-islam