Spiritual Meaning:
A desert can symbolize desolation and abandonment, but also a place of contemplation, quiet and divine revelation.

Psychological / Emotional Perspective:
Desertion implies that all support has been removed or rejected so the idea of deserting a post, task or friend suggests a sense of inadequacy. Experiencing ourselves as having been deserted signifies being left to our own devices.

Everyday Material Aspects:
To dream of being alone in a desert signifies a lack of emotional satisfaction, loneliness or perhaps isolation. Dreaming of being in a desert with someone else may show that particular relationship is sterile, or going nowhere.

You might also like to consult the entry for Abandoned.