To consider, to devise.
To think or consider carefully and fully; esp., to consider reasons for and against a thing in order to make up one's mind
Speculate is to buy or sell land or other investments that are high risk, with the goal to make a very big profit.
To call to mind; remember:
To use the powers of the mind, as in conceiving ideas, drawing inferences, and making judgments
Find another word for ratiocinate. In this page you can discover 9 synonyms, antonyms, idiomatic expressions, and related words for ratiocinate, like: cerebrate, cogitate, deliberate, reflect, speculate, think, put on one's thinking cap, use-one-s-head and thoughts.