Linguistically: To visit
Technically: Umrah is a way of worshipping Allah by making Tawaf of the Ka’bah and Sa’i between Mount Safa and Marwa and shaving or cutting the hair.
It is obligatory at least once in a lifetime as found in this hadeeth.
‘Aa’ishah said, ‘O Messenger of Allaah, do women have to engage in jihad?’ He said, ‘Yes, they must do jihad in which there is no fighting: Hajj and ‘Umrah,’