Countries that have an alliance, or agreement, help each other out when in need. That means during times of war, for example, if two countries have an alliance, one will help the other by providing weapons and supplies.

An alliance doesn't just have to be between two countries; you can see alliances formed on a playground, when kids start clustering in groups or dividing themselves into teams to play tag. An alliance is essentially a connection through which a common interest is shared. A marriage is an alliance between two people who decide to share their lives together.

Definitions of alliance
  1. noun
    the state of being allied or confederated
    synonyms: confederation
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    type of:
    coalition, fusion
    the state of being combined into one body
  2. noun
    a connection based on kinship or marriage or common interest
    “the shifting alliances within a large family”
    synonyms: bond
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    silver cord
    the emotional bond between a mother and her offspring
    type of:
    connectedness, connection, connexion
    a relation between things or events (as in the case of one causing the other or sharing features with it)
  3. noun
    the act of forming an alliance or confederation
    synonyms: confederation
    see moresee less
    type of:
    group action
    action taken by a group of people
  4. noun
    a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim
    see moresee less
    type of:
    accord, pact, treaty
    a written agreement between two states or sovereigns
  5. noun
    an organization of people (or countries) involved in a pact or treaty
    synonyms: alignment, alinement, coalition
    see moresee less
    nonalignment, nonalinement
    people (or countries) who are not aligned with other people (or countries) in a pact or treaty
    show 25 types...
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    an alliance of people or corporations or countries for a special purpose (formerly to achieve some antisocial end but now for general political or economic purposes)
    an alliance of nations joining together to fight a common enemy
    axis, bloc
    a group of countries in special alliance
    in World War I the alliance of Great Britain and France and Russia and all the other nations that became allied with them in opposing the Central Powers
    Central Powers
    in World War I the alliance of Germany and Austria-Hungary and other nations allied with them in opposing the Allies
    the alliance of nations that fought the Axis in World War II and which (with subsequent additions) signed the charter of the United Nations in 1945
    in World War II the alliance of Germany and Italy in 1936 which later included Japan and other nations
    entente, entente cordiale
    an informal alliance between countries
    popular front
    a leftist coalition organized against a common opponent
    global organization, international organisation, international organization, world organisation, world organization
    an international alliance involving many different countries
    Northern Alliance, United Front
    a multiethnic alliance in Afghanistan who practice a moderate form of Islam and are united in their opposition to the Taliban
    combination in restraint of trade
    (law) any monopoly or contract or combination or conspiracy intended to restrain commerce (which are illegal according to antitrust laws of the United States)
    Arab League
    an international organization of independent Arab states formed in 1945 to promote cultural and economic and military and political and social cooperation
    Common Market, EC, EEC, EU, Europe, European Community, European Economic Community, European Union
    an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members
    NATO, North Atlantic Treaty Organization
    an international organization created in 1949 by the North Atlantic Treaty for purposes of collective security
    OPCW, Organization for the Prohibition of Chemical Weapons
    international organization for chemical disarmament; administers the Chemical Weapons Convention
    OAS, Organization of American States
    an association including most countries in the western hemisphere; created in 1948 to promote military and economic and social and cultural cooperation
    OPEC, Organization of Petroleum-Exporting Countries
    an organization of countries formed in 1961 to agree on a common policy for the production and sale of petroleum
    League of Nations
    an international organization formed in 1920 to promote cooperation and peace among nations; although suggested by Woodrow Wilson, the United States never joined and it remained powerless; it was dissolved in 1946 after the United Nations was formed
    a group of nations having common interests
    CIS, Commonwealth of Independent States
    an alliance made up of states that had been Soviet Socialist Republics in the Soviet Union prior to its dissolution in Dec 1991
    UN, United Nations
    an organization of independent states formed in 1945 to promote international peace and security
    scheduled territories, sterling area, sterling bloc
    the group of countries whose currencies are tied to the British pound sterling
    a world organization of autonomous states that are united in allegiance to a central power but are not subordinate to it or to one another
    WTO, World Trade Organization
    an international organization based in Geneva that monitors and enforces rules governing global trade
    type of:
    organisation, organization
    a group of people who work together
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