1. forming theories or conjectures about something without firm evidence
Usage: present participle of speculate
2. investing in stocks, property, or other ventures in the hope of gain but with risk of loss
Usage: financial context

Examples

• Scientists are speculating about the cause of the unusual weather patterns.
• The media has been speculating on who will win the election.
• He’s been speculating in real estate for years.
• Many investors lost money speculating on tech stocks.
• We can only keep speculating until more evidence emerges.
• She made a fortune speculating in cryptocurrency.
• The detective was speculating about the suspect’s motives.