Definition of "infusion"

infusion

/ɪnˈfjuːʒən/

noun
countable and uncountable, plural infusions
1. A product consisting of a liquid which has had other ingredients steeped in it to extract useful qualities.
2. The act of steeping or soaking a substance in liquid so as to extract medicinal or herbal qualities.
3. The act of installing a quality into a person.
  Quotations
  [...] but in the verity of extolment / I take him to be a soul of great article and his infusion / of such dearth and rareness as, to make true diction of / him, his semblable in his mirror, and who else would / trace him, his umbrage, nothing more.
  c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene i]
4. (obsolete) The act of dipping into a fluid.
5. (medicine) The administration of liquid substances directly into a vein for medical purposes; perfusion.