Atom apex =D
Similar means closely related and contradictory means opposite.
Efficient. Although "expeditious" carries the meaning of doing something quickly as well as efficiently.
expeditious
In a word problem, the word 'is' most likely means that two quantities are equal.
Atom apex =D
atom
antiquated
boo
The output is a set of irreducible numerical semigroups containing it.
Malleable most closely means able to be reshaped by pressure.
The word that most closely means to stall by excessive talking is "ramble."
Fixate is probably the word that most closely means perfect focus.
involve,partcipate
The Latin root "muta-" most closely means change or exchange.
The root "luc" (seen in translucent and the Spanish word luz)
The act of beating