Please Define the Following Terms or Concepts in No More

Please define the following terms or concepts in no more than two sentences, and give an example to support your definition.
A. Active meditation
B. Altered state of consciousness
C. Detached observation
D. Enhanced receptivity
E. Exclusive meditation
F. Inclusive meditation
G. Insightful meditation
H. Ineffability
I. Koan
J. Mandala
K. Mantra
L. Meditation
M. Mindfulness meditation
N. Nadam
O. Neurotheology
P. Opening-up meditation
Q. Perception distortion
R. Present centeredness
S. Relaxation response
T. Restrictive meditation
U. Self-transcendence
V. Sensory overload
W. Split-brain theory
X. Synesthesia
Y. Time distortion
Z. Transcendental meditation
AA. Tratak
AB. Zen meditation
AC. Neuroplasticity
AD. Executive function