المعنى الاصطلاحي :

Seeking to revive the teachings and rituals of Islam and restore them to their original form as practiced during the time of the early Muslim generation (the Salaf; the righteous predecessors) through teaching people the Sunnah (guidance of the Prophet, may Allah's peace and blessings be upon him) and warning them against "bid‘ah" (religious innovations).

الشرح المختصر :

"Tajdeed-ud-Deen" means reviving the neglected rituals of the religion and the overlooked rulings of the Shariah by restoring the abandoned Sunnah and necessary knowledge. It is also achieved by reforming the affairs of the Islamic community in all walks of life: creed, worship, knowledge, etc. The essence of all this is devoting worship only and exclusively to Allah and fulfilling the requirements of the testimony that "there is none worthy of worship except Allah and that Muhammad is the Messenger of Allah." One of the manifestations of "tajdeed-ud-Deen" is to exterminate the existing religious innovations by correcting the theoretical, intellectual, practical, and behavioral deviations and purifying society from their effects and remnants. "Tajdeed-ud-Deen" occurs when Allah, the Exalted, assigns a Muslim scholar at the turn of every century with the task of teaching people the Sunnah and warning them against "bid‘ah".