Meccan surah

The Meccan surahs are the chronologically earlier chapters (surahs) of the Qur'an that were, according to Islamic tradition, revealed anytime before the migration of the Islamic prophet Muhammed and his followers from Mecca to Medina (Hijra). The Medinan surahs are those revelations that occurred after the move to the city of that name.
Meccan surahs are typically shorter than Medinan suras, with relatively short verses (ayat), and mostly come near the end of the Qur'an. (As a general rule, the surahs of the Qur'an are ordered from longest to shortest.) Most of the surahs containing Muqatta'at are Meccan.
The division of surahs into 'Meccan' and 'Medinan' is primarily a consequence of stylistic and thematic considerations. Clification of the surahs into these periods is based upon factors such as the length of the verse and the presence or absence of certain key concepts or words (e.g. al-Rahman as name of God).