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[14] Etymologically, consider means ‘observe the stars’. Amongst the most popular of ancient Roman methods of divination was astrology, and so the Latin verb consīderāre was coined (from the intensive prefix com- and sīdus ‘star’, source of English sidereal) to describe the activity of carefully noting the stars’ courses for the purpose of drawing auguries. From ‘observing stars’ it soon broadened out in meaning to simply ‘observe’, and hence figuratively ‘think over something’, but the sense ‘have an opinion’ seems to be an English development of the 16th century. English acquired the word via Old French considerer, but borrowed considerable directly from Latin consīderābilis; the modern sense ‘large in amount’ arose in the mid-17th century, on the basis of an earlier ‘worthy of consideration because of great quantity’.
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