IV

• iv, IIII, iiii
• IV. (name suffix)

One (I) less than five (V)

IV

1. A Roman numeral representing four (4).

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

IV (not comparable)

1. (medicine) Initialism of intravenous.

IV (plural IVs)

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

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

IV

1. Iupiter (English: Jupiter)

IV

1. 4