Definition of "at a time" []

• In a single, continuous period of time. (adverb)
• Simultaneously at each occurrence (of some action). (adverb)

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• "But in what could be its last act in power, non-euro Britain seemingly put paid to a proposal for all 27 EU nations to guarantee massive new borrowings on bond markets in the bloc's name, at a time when Portugal, Spain and Italy are coming under rising pressure from powerful speculators."
• "If it be asked what is most characteristic of the Ratio Studiorum, the following features may be mentioned: It was, first of all, a system well thought out and well worked out, and formulated at a time when in most educational establishments there was little system."
• "Agnello tells of a battle between the Ravennese and the Greeks at a time that is not well defined."