logical system, system of logic, logic - a system of reasoning

extrapolate - gain knowledge of (an area not known or experienced) by extrapolating

conclude, reason, reason out - decide by reasoning; draw or come to a conclusion; "We reasoned that it was cheaper to rent than to buy a house"

carry back - deduct a loss or an unused credit from taxable income for a prior period

surmise - infer from incomplete evidence

elicit - derive by reason; "elicit a solution"

obtain - come into possession of; "How did you obtain the visa?"

draw, reap - get or derive; "He drew great benefits from his membership in the association"

evolve - undergo development or evolution; "Modern man evolved a long time ago"

descend, derive, come - come from; be connected by a relationship of blood, for example; "She was descended from an old Italian noble family"; "he comes from humble origins"

etymologise, etymologize - give the etymology or derivation or suggest an etymology (for a word); "The linguist probably etymologized the words incorrectly"; "Although he is not trained in this, his hobby is etymologizing"

create, make - make or cause to be or to become; "make a mess in one's office"; "create a furor"

derive - come from; "The present name derives from an older form"

hail, come - be a native of; "She hails from Kalamazoo"