(psychology) The 1952 revision of the Diagnostic and Statistical Manual of Mental Disorders, published by the American Psychiatric Association.

(poetry) The narrator within a poem.

(biochemistry) A protein folding initiation site motif consisting of an amino acid sequence pattern and a local structure type.

plural of I²C

The state of one's own self or identity; one's conscious personality.

I-hood.

information superhighway

(rare) I-hood.

(informal) I understand.

(US) Expressing surprise or admiration.