Ⅳ

Alternative forms

• iv
• IIII, iiii (nonstandard, clock face)
• IIIJ, iiij (nonstandard)
• IV. (ordinal number)

Etymology

One (I) less than five (V)

Numeral

IV

1. A Roman numeral representing four (4).

Symbol

IV

1. Used to indicate an ordinal number; the fourth (common as a name suffix)
2. (inorganic chemistry) Specifying an oxidation state of 4
3. (music) major subdominant triad

Pronunciation

• IPA^(key): /ˌaɪ ˈviː/

Adjective

IV (not comparable)

1. (medicine) Abbreviation of intravenous.

   Alternative form: i.v.

Noun

IV (plural IVs)

1. (medicine) Initialism of intravenous injection.
2. (cryptography) Initialism of initialization vector.
3. (statistics) Initialism of instrumental variable.
4. Initialism of immigrant visa.

Anagrams

• -vi-, V. I., V.I., VI, Vi, v.i., vi, vi.

Etymology 1

Etymology 2