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consider [consider 词源字典]: consider: [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’.
=> desire, sidereal[consider etymology, consider origin, 英语词源]
consider (v.): late 14c., from Old French considerer (13c.) "reflect on, consider, study," from Latin considerare "to look at closely, observe," perhaps literally "to observe the stars," from com- "with" (see com-) + sidus (genitive sideris) "constellation" (see sidereal).

Perhaps a metaphor from navigation, but more likely reflecting Roman obsession with divination by astrology. Tucker doubts the connection with sidus, however, because it is "quite inapplicable to desiderare," and suggests derivation instead from the PIE root of English side meaning "stretch, extend," and a sense for the full word of "survey on all sides" or "dwell long upon." Related: Considered; considering.
considerable (adj.): mid-15c., "capable of being considered," from Medieval Latin considerabilis "worthy to be considered," from Latin considerare (see consider). Meaning "pretty large" is from 1640s (implied in considerably).
CONSIDERABLE. This word is still frequently used in the manner out by Dr. Witherspoon in the following remark: "He is considerable of a surveyor; considerable of it may found in the country. This manner of speaking in the northern parts." [Pickering, 1816]
considerate (adj.): 1570s, "marked by deliberation," from Latin consideratus, past participle of considerare (see consider). Of persons, "deliberate, prudent," 1580s; meaning "showing consideration for others" is from c. 1700. Related: Considerately; considerateness.
consideration (n.): mid-14c., "a beholding, looking at," also "keeping in mind," from Old French consideracion (12c., Modern French considération), from Latin considerationem (nominative consideratio) "consideration, contemplation, reflection," noun of action from past participle stem of considerare (see consider). Meaning "a taking into account" is from mid-15c.; that of "something given in payment" is from c. 1600.
inconsiderable (adj.): 1590s, from French inconsidérable (16c.), from in- "not" (see in- (1)) + considérable (see considerable). Related: Inconsiderably.
inconsiderate (adj.): late 15c., "done thoughtlessly," literally "not properly considered," from Latin inconsideratus "headstrong, unadvised, thoughtless," from in- "not, opposite of" (see in- (1)) + consideratus (see consider). Related: Inconsiderately; inconsiderateness.
inconsideration (n.): 1520s, from Late Latin inconsiderationem (nominative inconsideratio) "inconsiderateness," from inconsideratus (see inconsiderate).
Ironside: name given to a man of great hardihood or bravery, c. 1300, first applied to Edmund II, king of England (d.1016), later also to Oliver Cromwell and his troops. Old Ironsides as a nickname of U.S.S. "Constitution" dates from that ship's defeat of H.M.S. "Guerriere" on Aug. 19, 1812, in the War of 1812.
reconsider (v.): 1570s, from French reconsidérer and also from re- "back, again" + consider. Related: Reconsidered; reconsidering.
reconsideration (n.): 1650s, from re- "again" + consideration.