Dia is defined as going through or across or between.
(prefix)An example of dia used as a prefix is in the word "diagnosis," which means a thorough analysis of a disease.
See dia- in Webster's New World College Dictionary
Origin: ME < OFr < L < Gr dia, through, across < *disa, in two, apart < IE *dis- < base *dwo, two
See dia- in American Heritage Dictionary 4
or di-
prefixOrigin:
Origin: Greek
Origin: , from dia, through
.Learn more about dia-