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 ...
noun, plural parentheses. [puh-ren-thuh-seez] /pÉËrÉn Î¸ÉËsiz/ (Show IPA) 1. either or both of a pair of signs () used in writing to mark off an interjected explanatory or qualifying remark, to indicate separate groupings of symbols in mathematics and symbolic logic, etc. 2. Usually, parentheses. the material contained within these marks.