verb (used without object), doted, doting. Also, doat.
to bestow or express excessive love or fondness habitually (usually followed by on or upon ): They dote on their youngest daughter.
to show a decline of mental faculties, especially associated with old age.
decay of wood.

1175–1225; Middle English doten to behave foolishly, become feeble-minded; cognate with Middle Dutch doten.

doter, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dote or doat (dəʊt)
vb (foll by on or upon)
1.  to love to an excessive or foolish degree
2.  to be foolish or weak-minded, esp as a result of old age
[C13: related to Middle Dutch doten to be silly, Norwegian dudra to shake]
doat or doat
[C13: related to Middle Dutch doten to be silly, Norwegian dudra to shake]
'doter or doat
'doater or doat

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1200, from M.L.G. doten "be foolish," of unknown origin. Dotage, lit. "the state of one who dotes," first recorded late 14c. for "senility." Related: Doted; dotes; doting.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Sports fans who dote on statistics should get ready for a new lode.
New parents dote on their babies and toddlers, squealing with joy during their cheerleading efforts.
If they dote on you, you're better off adjusting to the tougher social world in which you'll have to find your way.
Some grandparents gladly volunteer for a job that gives them a chance to dote.
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