What is the meaning of 小?

smallness; small size, small (sometimes used as an abbreviation for small serving, etc.)

short for 小の月 (shō no tsuki)

during the Kamakura and Muromachi periods, a unit of field area equal to around 400 square metres (Can we verify this sense?)

small, little

suffix after names of elementary schools

a surname

less in size or quantity, small, little, short

less in intensity, small, light, slight

of secondary importance, secondary, sub-

infant

attached to certain nouns:

1. small in shape or scale

   small in shape or scale

   attached to certain names to give expression or feelings (Can we verify this sense?)

   used proverbially to represent "small" or "slight" (Can we verify this sense?)

   attached to certain nouns to mean:

   1. small
   2. fine
   3. slight

   small

   fine

   slight

   Source: wiktionary.org