alumnus = boy or man who was a pupil or student of a school, college or university

• IIM-Calcutta alumnus Shyam Srinivasan is the MD and CEO of Federal Bank.

alumna = girl or woman who was a pupil or student of a school, college or university

• Ms. Moly Sunny is an alumna of St. Joseph’s College, Irinjalakkuda.
• Chanda Kochhar, the MD and CEO of ICICI bank is alumna of University of Mumbai

alumni is the plural of alumnus (can include women also)

• Mammootty and Salim Kumar are alumni of Maharaja’s College, Ernakulam.
• Kavya and Mohan are alumni of IIT Bombay.

alumnae is the plural of alumna (when the group contains only women)

• Kavya and Kavita are alumnae of the Women’s Polytechnic.