noun

• (historical) Former British unit of currency worth one-quarter of an old penny; or a coin representing this.
  ""Nay, Heaven forbid, indeed," quoth Robin, "that I should take from such as thee, jolly fellow! Not so much as one farthing would I take from thee, for I love a fair Saxon face like thine right well—more especially when it cometh from Locksley Town, and most especially when the man that owneth it is to marry a bonny lass on Thursday next. But come, tell me for what price thou wilt sell me all of thy meat and thy horse and cart.""
• (figurative) A very small quantity or value; the least possible amount.
  "That period of infatuation was not unrelieved by a certain amount of self-introspection on my part. I kept account of every farthing I spent, and my expenses were carefully calculated. Every little item such as omnibus fares or postage or a couple of coppers spent on newspapers, would be entered, and the balance struck every evening before going to bed. That habit has stayed with me ever since, and I know that as a result, though I have had to handle public funds amounting to lakhs, I have succeeded in exercising strict economy in their disbursement, and instead of outstanding debts have had invariably a surplus balance in respect of all the movements I have led."
• (obsolete) A division of land.