In general, a broadcast season lasts between September through August. A series premiering at mid-season is considered a short season 1.
The confusion probably comes from the show's official DVD release, which combines the 2-hour pilot plus two other episodes, all of which originally aired on CBS in the spring of 1993, and the first full season (23 episodes), which premiered in the fall of 1993.
I hope this clarifies the issue. Please write back of you have any more questions. Thanks for posting.