portion vs proportion

portion

verb
  • To divide into amounts, as for allocation to specific purposes. 

  • To endow with a portion or inheritance. 

noun
  • An allocated amount. 

  • That which is divided off or separated, as a part from a whole; a separated part of anything. 

  • One's fate; lot. 

  • A wife's fortune; a dowry. 

  • The part of an estate given or falling to a child or heir; an inheritance. 

proportion

verb
  • To divide into proper shares; to apportion. 

  • To form symmetrically. 

  • To set or render in proportion. 

noun
  • The relation of one part to another or to the whole with respect to magnitude, quantity, or degree. 

  • Harmonious relation of parts to each other or to the whole. 

  • A quantity of something that is part of the whole amount or number. 

  • A statement of equality between two ratios. 

  • Size. 

  • Proper or equal share. 

How often have the words portion and proportion occurred in a corpus of books? (source: Google Ngram Viewer )