Found in the following dictionaries
TWL06 (NASPA List 2006)
"K" Definition
noun
Any of the speech sounds represented by the letter k.
Source: American Heritage Dictionary
Something shaped like the letter K.
Source: American Heritage Dictionary
The 11th in a series.
Source: American Heritage Dictionary
The 11th letter of the modern English alphabet.
Source: American Heritage Dictionary
The 11th letter of the English alphabet.
Source: Merriam-Webster
abbreviation
Karat.
Source: American Heritage Dictionary
Kelvin.
Source: Merriam-Webster
Kilometer.
Source: Merriam-Webster
Karat.
Source: Merriam-Webster
Kindergarten.
Source: Merriam-Webster
symbol
Potassium.
Source: Merriam-Webster