dyad vs intimate

dyad

noun
  • Two persons in an ongoing relationship; dyadic relationship. 

  • A tensor of order two and rank one. 

  • An element, atom, or radical having a valence of or combining power of two. 

  • A chromosome structure, usually X- or V-shaped, consisting of two condensed sister chromatids joined by a centromere. 

  • A set of two elements treated as one; a pair. 

  • The relationship or interaction itself in reference to a couple. 

  • Any set of two different pitch classes. 

  • A secondary unit of organisation consisting of an aggregate of monads. 

intimate

noun
  • A very close friend. 

  • Women's underwear, sleepwear, or lingerie, especially offered for sale in a store. 

adj
  • Pertaining to details that require great familiarity to know. 

  • Closely acquainted; familiar. 

  • Very finely mixed. 

  • Of or involved in a sexual relationship. 

  • Personal; private. 

verb
  • To suggest or disclose (something) discreetly. 

  • To notify. 

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