A national unity government, government of national unity, or national union government is a broad coalition government consisting of all parties (or all major parties) in the legislature, usually formed during a time of war or other national emergency.
http://en.wikipedia.org/wiki/National_unity_government
A grand coalition is an arrangement in a multi-party parliamentary system in which the two largest political parties of diametrically opposed political ideologies unite in a coalition government. The term is most commonly used in countries where there are two dominant parties with different ideological orientations, and a number of smaller parties large enough to secure representation in the parliament. The two large parties will each try to secure enough seats in any election to have a majority government alone, and if this fails each will attempt to form a coalition with smaller parties that have a similar ideological orientation. Because the two large parties will tend to differ on major ideological issues, and portray themselves as rivals, or even sometimes enemies, they will usually find it more difficult to agree on a common direction for a combined government with each other than with smaller parties.
http://en.wikipedia.org/wiki/Grand_coalition
A coalition government is a cabinet of a parliamentary government in which several political parties cooperate. The usual reason given for this arrangement is that no party on its own can achieve a majority in the parliament. A coalition government might also be created in a time of national difficulty or crisis, for example during wartime, or economic crisis, to give a government the high degree of perceived political legitimacy, or [collective ideology] it desires whilst also playing a role in diminishing internal political strife. In such times, parties have formed all-party coalitions (national unity governments, grand coalitions). If a coalition collapses, a confidence vote is held or a motion of no confidence is taken.
http://en.wikipedia.org/wiki/Coalition_government
http://en.wikipedia.org/wiki/National_unity_government
A grand coalition is an arrangement in a multi-party parliamentary system in which the two largest political parties of diametrically opposed political ideologies unite in a coalition government. The term is most commonly used in countries where there are two dominant parties with different ideological orientations, and a number of smaller parties large enough to secure representation in the parliament. The two large parties will each try to secure enough seats in any election to have a majority government alone, and if this fails each will attempt to form a coalition with smaller parties that have a similar ideological orientation. Because the two large parties will tend to differ on major ideological issues, and portray themselves as rivals, or even sometimes enemies, they will usually find it more difficult to agree on a common direction for a combined government with each other than with smaller parties.
http://en.wikipedia.org/wiki/Grand_coalition
A coalition government is a cabinet of a parliamentary government in which several political parties cooperate. The usual reason given for this arrangement is that no party on its own can achieve a majority in the parliament. A coalition government might also be created in a time of national difficulty or crisis, for example during wartime, or economic crisis, to give a government the high degree of perceived political legitimacy, or [collective ideology] it desires whilst also playing a role in diminishing internal political strife. In such times, parties have formed all-party coalitions (national unity governments, grand coalitions). If a coalition collapses, a confidence vote is held or a motion of no confidence is taken.
http://en.wikipedia.org/wiki/Coalition_government
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national unity government (για συντομία, unity government) = κυβέρνηση εθνικής ενότητας
grand coalition = κυβέρνηση μεγάλου συνασπισμού
coalition government = κυβέρνηση συνασπισμού
