-cum

• (Classical) IPA^(key): /kum/, [kũ]

Combining form of cum.

-cum (indeclinable)

1. (after personal pronouns or qui forms) with

   Mecum.

   With me.

   Tecum.

   With you.

• (after personal pronouns or qui forms: with): mecum, tecum, secum, nobiscum, vobiscum, quicum, quocum, quacum, quibuscum

Substantivisation of the neuter forms of -cus.

-cum n (genitive -cī); second declension

1. suffixed to nouns of any gender, forms neuter nouns

   cantus + -cum → canticum

Second declension.

• “-cum” on page 470/1 of the Oxford Latin Dictionary (1st ed., 1968–82)

Declined forms of -cus.

-cum

1. nominative neuter singular of -cus
2. accusative masculine singular of -cus
3. accusative neuter singular of -cus
4. vocative neuter singular of -cus