oh

Multiple Entries:
  oh    OH    O  

Concise Oxford English Dictionary © 2008 Oxford University Press:
oh1

▶exclamation

• 1 expressing surprise, disappointment, joy, or other emotion.

• 2 used when responding to something that has just been said.

Concise Oxford English Dictionary © 2008 Oxford University Press:
oh2

▶noun variant spelling of O1 (sense 4).

Concise Oxford English Dictionary © 2008 Oxford University Press:
OH

▶abbreviation Ohio (in official postal use).

Concise Oxford English Dictionary © 2008 Oxford University Press:
O1 (also o)

▶noun (pl. Os or O's)

• 1 the fifteenth letter of the alphabet.

• 2 denoting the next after N in a set of items, categories, etc.

• 3 a human blood type (in the ABO system) lacking both the A and B antigens.

• 4 (also oh) zero (in a sequence of numerals, especially when spoken).

Concise Oxford English Dictionary © 2008 Oxford University Press:
O2

▶abbreviation

• 1 US Ohio.

• 2 Cricket (on scorecards) over(s).

▶symbol the chemical element oxygen.

Concise Oxford English Dictionary © 2008 Oxford University Press:
O3

▶exclamation

• 1 archaic spelling of oh1.

• 2 used before a name in the vocative.