Definitions for "Minister of State"
a junior Minister in the Federal or Central Government who may assist a cabinet minister or have independent charge of a ministry
a member of HM's Government, junior only to a Secretary of State but senior to a Parliamentary Under Secretary of State
Minister of State is a title borne by politicians or officials in certain countries governed under a parliamentary system. In some countries a "minister of state" is a junior minister, who is assigned to assist a specific cabinet minister. In others countries a "minister of state" is a holder of a more senior position, such as a cabinet minister or even a head of government.