Yes, if he was a full-time student for five months of the year, you can most likely claim him as your dependent.
As a student, his time away from home is considered a temporary absence, so that he can be considered to have lived with you all year.
The main criteria being that he didn't provide over 50% of his own support. Here's more info on What does Financially Support Mean? and for Claiming a Dependent.
[Edited 3/18/2024 | 12:08 pm]
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