The process of using your mind to consider something carefully
Intellection
Mentation
Thinking
Thought
Thought process
Higher cognitive process
Consideration
Construction
Convergent thinking
Divergent thinking
Excogitation
Explanation
Free association
Ideation
Line of thought
Logical thinking
Mental synthesis
Mysticism
Out-of-the-box thinking
Planning
Preparation
Problem solving
Provision
Reasoning
Thread
Abstract thought
Train of thought
Cerebrate