"Meditate"

means,

To ponder; think deeply about; study; turn over in the mind; especially with regard
to the great truths
of religion.
Blessed is the man
that walketh not in the counsel of the ungodly, nor standeth in the way of sinners, nor sitteth in the seat of the scornful. But his delight is in the law of the Lord; and in His law doth he meditate day and night. And he shall be like a tree planted by the rivers of water, that bringeth forth his fruit in his season;
his leaf also shall not wither; and
whatsoever he doeth
shall prosper.

Psalm 1:1-3