human resources

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun plural The persons employed in a business or organization; personnel.
• noun plural The field of personnel recruitment, retention, and management.
• noun plural The department within an organization that is concerned with hiring employees and explaining the organization's policies and conditions of employment.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun management The personnel department of an organization, dealing with the recruitment, administration, management and training of employees; abbreviated as HR.
• noun management The personnel employed in an organization.