Spiritual Meaning:
A derelict building or person signifies a lack of hope, a ‘lost sheep’.

Psychological / Emotional Perspective:
Since hope and faith are two prime motivators, anything that appears derelict suggests that we have lost the ability to move away from difficult circumstances.

Everyday Material Aspects:
When the energy has gone from a project or, for instance, a relationship, and it has lost focus, we may dream of dereliction. This is when there is no hope of re-energizing the project or relationship.

Also consult the entry for Demolition.