In weeks of 7 days, three months can be 12 weeks and 5 or 6 days, or 13 weeks, or 13 weeks and 1 day. There are at least 4 weeks (28 days) in every month, but the number of â¦days varies. Some months have 30 days (April, June, September, November) and some have 31 days (January, March, May, July, August, October, December).
1540s ,  words , clauses , etc. inserted into a sentence ,  from Middle French parenthÃ¨se ( 15c. ) , from Late Latin parenthesis  addition of a letter to a syllable in a word ,  from Greek parenthesis , literally  a putting in beside ,  from parentithenai  put in beside ,  from para -  beside  ( see para - ( 1 ) ) + en -  in  + tithenai ...
Algebra. 1  an exponent. 2  the integer n in a radical defining the n- th root: â is a radical having index three. 3  a subscript or superscript indicating the position of an object in a series of similar objects, as the subscripts 1, 2, and 3 in the series x 1 , x 2 , x 3 4  . winding number.