a dictionary is a book with the definitions of various words and often has other grammatical information and things like that, also a dictionary is what your currently using and looking up the definition for.
also looking up the word "dictionary" in a dictionary is a paradox and thus by reading this sentence you are risking the safety of the entire universe :(
dude 1 : "hey dude whats a freezer?"
dude 2 : "look it up in a dictionary."
dude 1 : "whats a dictionary?"
dude 2 : *gives the guy a dictionary* "this is a dictionary"
dude 1 : thanks man
dude 2 *thinks to self* "I'm never eating at his house again"
its used to help math student remember the order of operations in this order : parenthesis, exponent, multiplication, division, addition, subtraction.
but sadly in middle school advanced honors math they told me that we use g.e.m.d.a.s. which is the same but the "g" means grouping symbols
P.E.M.D.A.S. IS AN ACRONYM FOR :
PLEASE EXCUSE MY DEAR AUNT SALLY
( ), x2, 2*2, 1/2, 2+2, 2-56.
THE ABOVE OPERATIONS ARE IN MATH FORM AND ORDER