**Intraclass Correlation**: A measure of reliability or agreement within groups.

**Intraclass Variation**: Differences observed among members of the same class.

**Intraclass Distance**: The similarity between items in a single category.

**Intraclass Analysis**: Statistical examination focused on one classification group.

**Intraclass Comparison**: Evaluation comparing elements within the same category only.

Relating to comparisons within a single category.

Pertaining to interactions among members of one class.

Describing relationships inside the same group or type.

Involving metrics calculated from identical classifications.

Concerning variations occurring within the same classification system.