What does Madd mean?
Triggered by specific letters and combinations, madd can extend a vowel from two counts up to six or more depending on the type, and getting the length right is a nuanced Tajweed skill.
Tajweed Rule
Madd
مَدّ · /mædː/
Madd is a Tajweed rule that elongates certain vowel sounds for a set number of counts during recitation.