to empty the mind of thoughts and fix the attention on one matter, esp as a religious or spiritual exercise
to engage in deep or serious reflection
(often + on/upon) to focus one's attention on (something); to consider or plan (something) in the mind
meditative /-tiv/ adj
meditatively /-tivli/ adv
meditativeness noun
meditator noun
[Latin meditatus, past part. of meditari]