Found in the following dictionaries
TWL06 (NASPA List 2006)
"P" Definition
noun
A hypothesized documentary source of certain portions of the Pentateuch that have a formal style, contain genealogical lists and descriptions of rituals, and use the Tetragrammaton to refer to God.
Source: American Heritage Dictionary
Any of the speech sounds represented by the letter p.
Source: American Heritage Dictionary
Something shaped like the letter P.
Source: American Heritage Dictionary
The 16th in a series.
Source: American Heritage Dictionary
The 16th letter of the modern English alphabet.
Source: American Heritage Dictionary
Physics The symbol for momentum.
Source: American Heritage Dictionary
abbreviation
Piano (musical direction).
Source: American Heritage Dictionary
Proton.
Source: American Heritage Dictionary
Pressure.
Source: Merriam-Webster
Pitch.
Source: Merriam-Webster
Pole.
Source: Merriam-Webster
symbol
Phosphorus.
Source: Merriam-Webster