Orientation means providing new employees with basic information about the employer. Training programs are used to ensure that the new employee has the basic knowledge required to perform the job satisfactorily. ... Unfortunately, orientation and training programs are often overlooked. https://www.cliffsnotes.com/study-guides/principles-of-management/staffing-and-human-resource-management/orientation-and-training-programs

AS for BUsiness English, I mean English that is especially related to international trade. And I asked why because I want to know why "orientation" refers to 迎新情况介绍 in Business English.

Hey! As you guys suggested, the context goes like following: external recruitment will entail more costs for orientation and taining.

As John suggested, it could mean several things in different contexts. 'Business English' tends to be a phrase that is used by people selling courses. And what do you mean by 'why'?

It would help if you could provide more context.