intellect-, intellig-

1. Someone's ability to think, reason, and understand.
2. Very intelligent and knowledgeable.

1. The ability to learn facts and skills and apply them; especially, when this ability is highly developed.
2. The capacity to acquire and apply knowledge or the faculty of thought and reason.
3. Information about secret plans or activities; especially, those of foreign governments, the armed forces, business enemies, or criminals.
4. Etymology: from Latin intelligent-, formed from intellegere,, “to perceive, to discern”; from inter-, “between” plus legere, “to choose, to read”.

1. Having intelligence, especially to a highly developed degree.
2. Aware, knowledgeable, or informed.
3. Etymology: from Latin intelligent-, formed from intellegere, “to perceive, to discern”; from inter-, “between” plus legere, “to choose, to read” (source of English "select" and "legible").

The most intelligent, intellectual, or highly educated members of a society or community, especially those who are interested in the arts, literature, philosophy, and politics.

1. Capable of being understood.
2. Perceptible only by the mind, not the senses.

1. Poorly articulated or enunciated, or drowned out by noise; for example, unintelligible speech.
2. Not clearly understood or expressed.