Dawah: calling and inviting non-muslims to Islam by sharing the message with them
Day of Arafa: the ninth day of Thul-Hijjah, the 12th month, and the second day of the pilgrimage rites. For those not performing the pilgrimage, it is recommended to fast this day and spend the day in worship. It signifies the time when Islam was perfected and approved as a way of life for all Muslims.
Deen: the way of life for Muslims, the way to worship God
Dua: petitionary prayer when making requests
Dunya: this worldly existence