without beginning or end , eternal (sempiternus denotes what is perpetual, what exists as long as time endures, and keeps even pace with it; aeternus, the eternal , that which is raised above all time , and can be measured only by œons . Thus the sublime thought, without beginning and end, is more vividly suggested by aeternus than by sempiternus , since the former has more direct reference to the long duration of the eternal, which has neither beginning nor end. Sempiternus is rather a mathematical, aeternus

http://lila-erc.eu/data/lexicalResources/LewisShort/id/LexicalSense/n1413.0 an entity of type: LexicalSense

without beginning or end , eternal (sempiternus denotes what is perpetual, what exists as long as time endures, and keeps even pace with it; aeternus, the eternal , that which is raised above all time , and can be measured only by œons . Thus the sublime thought, without beginning and end, is more vividly suggested by aeternus than by sempiternus , since the former has more direct reference to the long duration of the eternal, which has neither beginning nor end. Sempiternus is rather a mathematical, aeternus 
without beginning or end , eternal (sempiternus denotes what is perpetual, what exists as long as time endures, and keeps even pace with it; aeternus, the eternal , that which is raised above all time , and can be measured only by œons . Thus the sublime thought, without beginning and end, is more vividly suggested by aeternus than by sempiternus , since the former has more direct reference to the long duration of the eternal, which has neither beginning nor end. Sempiternus is rather a mathematical, aeternus 

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