only 1 use
- ...studies, students, born of thee, Thee in thy democratic fetes en-masse, thy high original festivals, operas, lecturers, preachers, Thee in thy ultimate, (the preparations only now completed, the edifice on sure foundations tied,) Thee in thy pinnacles, intellect, thought, thy topmost rational joys, thy love and godlike aspiration, In thy resplendent coming literati, thy full-lung'd orators, thy sacerdotal bards, kosmic savans, These! these in thee, (certain to come,) to-day I prophesy.Book 31 — Thou Mother with Thy Equal Brood.... (68% in)
There are no more uses of "rational" in Leaves of Grass.
Typical Usage (best examples)