{a+bi: a and b are real numbers, and i = (-1)^0.5}

not simple

a set from which there exists an injection to the natural numbers

nouns that are not batch nouns

lim h -> 0 (f(x+h)-f(x))/h

a financial contract whose value is based on or derived from, a traditional security (such as a stock or bond), an asset or a market index

a group where every element except the additive identity has a multiplicative inverse

a place on which to play soccer/football

for all epsilon > 0 there exists a delta > 0 such that |f(x)-f(x0)|< epsilon for all x satisfying 0 < |x-x0| < delta

the greatest possible degree of something

a rectangular array of quantities or expressions set out by rows and columns; treated as a single element and manipulated accordingly

a movie involving Neo and Morpheus

angle greater than pi/2 radians but less than pi radians

lacking in insight or discernmentan

a number with exactly two positive integer factors

a tasty type of rib

a set with +, * following the axioms of closure under + and *, associativity under + and *, communatativity of +, and distribution. The set also has a 0 and - operation.

that which must be 'cast back into the fiery chasm from whence it came'

a number with an odd number of distinct positive integer factors

a formal and conservative person with old-fashioned views