alumnus

[uh-luhm-nuh s] /əˈlʌm nəs/
noun, plural alumni
[uh-luhm-nahy, -nee] /əˈlʌm naɪ, -ni/ (Show IPA)
1.
a graduate or former student of a specific school, college, or university.
2.
a former associate, employee, member, or the like:
He invited all the alumni of the library staff to the party.
Origin
1635-45; < Latin: foster son, pupil, equivalent to al- (stem of alere to feed, support) + -u- (< stem-vowel *-o- in interior syllable) + -m(i)nus, orig. passive participial suffix (cf. adult, old), akin to Greek -menos; see phenomenon
Can be confused
alum, alumna, alumnae, alumni, alumnus (see usage note at the current entry)
Usage note
Alumnus (in Latin a masculine noun) refers to a male graduate or former student; the plural is alumni. An alumna (in Latin a feminine noun) refers to a female graduate or former student; the plural is alumnae. Traditionally, the masculine plural alumni has been used for groups composed of both sexes and is still widely so used: the alumni of Indiana University. Sometimes, to avoid any suggestion of sexism, both terms are used for mixed groups: the alumni/alumnae of Indiana University or the alumni and alumnae of Indiana University. While not quite equivalent in meaning, the terms graduate and graduates avoid the complexities of the Latin forms and eliminate any need for using a masculine plural form to refer to both sexes.
Examples from the web for alumnus
  • The new school was starting out with a generous gift from an alumnus.
British Dictionary definitions for alumnus

alumnus

/əˈlʌmnəs/
noun (pl) -ni (-naɪ)
1.
(mainly US & Canadian) a graduate of a school, college, etc
Word Origin
C17: from Latin: nursling, pupil, foster son, from alere to nourish
Word Origin and History for alumnus
n.

1640s, from Latin alumnus "a pupil," literally "foster son," vestigial present passive participle of alere "to nourish" (see old), with ending akin to Greek -omenos. Plural is alumni. Fem. is alumna (1882), fem. plural alumnae.