acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction; "of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced"
a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena; "a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory of alkalis that later was accepted in chemical practices"
a proposal intended to explain certain facts or observations
an administrative unit of government; "the Central Intelligence Agency"; "the Census Bureau"; "Office of Management and Budget"; "Tennessee Valley Authority"
the state of being in action or exerting power; "the agency of providence"; "she has free agency"
the act of drawing spatially closer to something; "the hunter's approach scattered the geese"
a relatively short golf shot intended to put the ball onto the putting green; "he lost the hole when his approach rolled over the green"
ideas or actions intended to deal with a problem or situation; "his approach to every problem is to draw up a list of pros and cons"; "an attack on inflation"; "his plan of attack was misguided"
a close approximation; "the nearest approach to genius"
the temporal property of becoming nearer in time; "the approach of winter"
the event of one object coming closer to another
make advances to someone, usually with a proposal or suggestion; "I was approached by the President to serve as his adviser in foreign matters"
come near in time; "Winter is approaching"; "approaching old age"
move towards; "We were approaching our destination"; "They are drawing near"; "The enemy army came nearer and nearer"