/
dɪˈmɪnjʊtɪv/
adj.
  - extremely or unusually small.
 - (of a word, name, or suffix) implying smallness, either actual or as an expression of affection or scorn (e.g. teeny, -let).
 
n.
 a diminutive word or suffix. 
▸a shortened informal form of a name.
Derivative
- diminutively adv.
  - diminutiveness n.
 
Etymology
ME: from OFr. diminutif, -ive, from late L. diminutivus, from L. deminut-, deminuere ‘lessen’.