Definition of careers:
(n) :
One’s calling in life; one's working occupation or profession, especially when pursued seriously and/or over a long period of time.
(n) :
The course, evolution, and ongoing advancement of one's working life, especially in one particular field.
(n) :
The general course of one's action or conduct in life, or in a particular area of life.
(adj) :
Doing something professionally, for a living (generally said of something that is not a commonplace job, e.g. criminal activity).
(n) :
A jouster's path during a joust.
(n) :
(falconry) The flight of a hawk.