English to English

verb (v)

• to believe especially on uncertain or tentative grounds(verb.cognition)

  Synonym:
  conjecture, hypothecate, hypothesise, hypothesize, suppose, theorise, theorize
  

  source: wordnet30
• talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion(verb.communication)

  source: wordnet30
• reflect deeply on a subject(verb.cognition)

  Example:
  Philosophers have speculated on the question of God for thousands of years.
  

  Synonym:
  chew over, contemplate, excogitate, meditate, mull, mull over, muse, ponder, reflect, ruminate, think over
  

  source: wordnet30
• invest at a risk(verb.possession)

  Synonym:
  job
  

  source: wordnet30
• To consider by turning a subject in the mind, and viewing it in its different aspects and relations; to meditate; to contemplate; to theorize; as, to speculate on questions in religion; to speculate on political events.(verb)

  source: webster1913
• To consider attentively; as, to speculate the nature of a thing.(verb)

  source: webster1913