To weigh in the mind with thoroughness and care.(verb-transitive)
To reflect or consider with thoroughness and care.(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "ponder" in a sentence
"So, what I continue to ponder is ... why does the theme work so perfectly in Star Trek?"
"Another thing to ponder is the action (or, non-action) of various chapters of the VFW, American Legion, etc. who choose to dismiss these revelations as inconsequential."
"What I ponder is whether these effects justify a blanket rule."