A decrease in the central pressure of a surface low pressure system. The storm is intensifying.

A decrease in the central pressure of a pressure system. Usually applied to a low rather than to a high.

A decrease in the central pressure of a pressure system. This term is often applied to a low rather than a high, although technically it is acceptable in either case.

As it refers to atmospheric pressure, a decrease in the central pressure of a low. This is usually accompanied by intensification of the cyclonic circulation (counter-clockwise wind flow around the low).

in hypnosis, this refers to attaining a more profound trance state.

a process of becoming deeper and more profound

going into a deeper state of consciousness