alumna / alumnus / alumni / alumnae
The gendered Latin forms for a graduate, and the everyday substitutes.
Traditional forms: alumna (one woman), alumnae (women), alumnus (one man, or one graduate of unspecified sex in older use), alumni (men, or a mixed or unspecified group). In most contexts, alumni is the ordinary plural for a mixed group. Alum and alums are acceptable informal stand-ins when you do not want the Latin. Do not use alumni for one person.
Examples
UseShe is an alumna of Reed.
UseHe is an alumnus of Reed.
UseThe alumni raised the endowment.
AvoidShe is an alumni of Reed.
UseTwo alums spoke at lunch.