sentimiento
feeling
sentiment
a view or opinion that is held or expressed
+
-o
masculine noun ending
Sentimiento means feeling and is directly related to the English word sentiment0, which means a view or opinion that is held or expressed0, plus the -o1 ending for a masculine noun1 in Spanish.
noun
  1. feeling
    An emotion or feeling experienced by a person.
    Expresó sus sentimientos en una carta. // He expressed his feelings in a letter.