The act or process of making permanent.

固定。

The state of being permanent.

持久。

The process by which an element is combined in a stable compound so as to become available for commercial use.

【化】凝固。

The process of tendering permanent a negative or print.

【摄】定影方式。

Obsessive preoccupation with some idea or complex.

【医】(心理分析)过于固执于某观念或耽于某种情绪；病态执着。