Meaning : Reflect deeply on a subject.
Example :
I mulled over the events of the afternoon.
Philosophers have speculated on the question of God for thousands of years.
The scientist must stop to observe and start to excogitate.
Synonyms : chew over, contemplate, excogitate, mull, mull over, muse, ponder, reflect, ruminate, speculate, think over
Meaning : Think intently and at length, as for spiritual purposes.
Example :
He is meditating in his study.
Synonyms : contemplate, study