Wiktionary
n. (context Hinduism English) Name of the second month in Hindu lunar calendar.
Wikipedia
Vaisakha' Vaishakha' or Baisakha (Hindi: बैसाख) is a month of the Hindu calendar that corresponds to April/May in the Gregorian Calendar. In the Indian national calendar Vaisakha is the second month of the year. It is the first month of the Nepali calendar (the Vikram Samvat), Punjabi calendar and the Bengali calendar (where it is called Boishakh). Regional calendars used on the sub-continent have two aspects: lunar and solar. Lunar months begin with Chaitra and solar months start with Vaisakha Sankranti. However, regional calendars mark one one official new year is celebrated. In regions such as Maharashtra which begin the official new year with the commencement of the lunar year, the solar year is marked by celebrating Vaisakha Sankranti. Conversely, regions starting the new year with Vaisakha Sankranti, give prominence to the start of the lunar year in Chaitra.