ADJECTIVE (3)

1. relating to or resulting from the action of a torrent;
- Example: "torrential erosion"
- Example: "torrential adaptations seen in some aquatic forms"

2. resembling a torrent in force and abundance;
- Example: "torrential applause"
- Example: "torrential abuse"
- Example: "the torrential facility and fecundity characteristic of his style"- Winthrop Sargeant

3. pouring in abundance;
- Example: "torrential rains"

The Collaborative International Dictionary of English v.0.48:

Torrential \Tor*ren"tial\, Torrentine \Tor*ren"tine\, a.
   Of or pertaining to a torrent; having the character of a
   torrent; caused by a torrent . [R.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

torrential
    adj 1: relating to or resulting from the action of a torrent;
           "torrential erosion"; "torrential adaptations seen in
           some aquatic forms"
    2: resembling a torrent in force and abundance; "torrential
       applause"; "torrential abuse"; "the torrential facility and
       fecundity characteristic of his style"- Winthrop Sargeant
    3: pouring in abundance; "torrential rains"