Wordnet 3.0
NOUN (2)
1. 
 (Judaism) the honor of being called up to the reading desk in the synagogue to read from the Torah; 
- Example: "he was called on for an aliyah"2. 
 (Judaism) immigration of Jews to Israel; 
- Example: "students making aliyah"
WordNet (r) 3.0 (2006):
aliyah
    n 1: (Judaism) the honor of being called up to the reading desk
         in the synagogue to read from the Torah; "he was called on
         for an aliyah"
    2: (Judaism) immigration of Jews to Israel; "students making
       aliyah"