How is a "rookie" defined as in the MLB?

Question

I know there are players who are "called up in the minors" and used in MLB games and demoted...how do you define the term "rookie" in the majors.

Answer 1

Your first full season in the majors.

Answer 2

If you play a majority of the season and start at a position, then in your first year of doing this, you are a rookie.

Answer 3

A rookie is defined in the Major Leagues as someone who is either in their first season of major league service, or someone who is NOT in their first season in the majors but has yet to fulfill either of the following requirements:

1) 130 major league at bats or 50 major league innings pitched

2) 45 days on the active 25 man major league roster.

So for instance,  a guy who gets called up for two weeks and has 10 at bats or something, or is a pitcher who makes a couple of spot starts or a few innings in relief, is still considered a rookie the next year.  

However, if a guy is called up and sits on the bench for over 45 days, even if he has fewer than 130 at bats, he has fulfilled his rookie status that year, and next year he will not be considered a rookie.

Answer 4

If a player has less then 90 at bats, or 45 innings pitched or less then 45 days on a MLB roster before September. Then he can be a rookie. So if you are called up several times to the Majors, and none of these benchmarks are met, the next year if you make the MLB team you would be considered a rookie.

Answer 5

if i is there firs year as a major