1 Informal (chiefly Brit) a difficult or delicate problem
2 (Also called)
tickler file (U.S.) a memorandum book or file
3 (Accounting) (U.S.) a single-entry business journal
4 a person or thing that tickles
n a very amusing joke or story
n a small inductance coil connected in series in the anode circuit of a valve and magnetically coupled to a coil in the grid circuit to provide feedback
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"