(computing) Initialism of man-machine interface. / (seismology) Initialism of modified Mercalli intensity.

A list of personnel who have appropriate security clearance to know the details of a particular operation or other sensitive information.

(idiomatic) Someone with the same feelings or attitudes as oneself. / Someone or something with which one feels connected.

The action of turning one's thoughts upon internal or spiritual matters. / (psychology) A personality orientation towards the self and mental abstraction; behavior expressing such orientation.