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 ...
A parenthetical statement is one that explains or qualifies something. You can call such a statement a parenthetical, (especially when it's in parentheses).