Pronunciation: (spek'yu-lā"tiv, -lu-tiv),[key] —adj. 1. pertaining to, of the nature of, or characterized by speculation, contemplation, conjecture, or abstract reasoning: a speculative approach. 2. theoretical, rather than practical: speculative conclusions. 3. given to speculation, as persons, the mind, etc.
4. of the nature of or involving commercial or financial speculation: speculative ventures. 5. engaging in or given to such speculation.