Definitions from Wiktionary ( )

▸ noun:  One who makes a tick mark.
▸ noun:  A measuring or reporting device, particularly one which makes a ticking sound as the measured events occur.
▸ noun:  A ticker tape, either the traditional paper kind or a scrolling message on a screen.
▸ noun:  (slang) A heart, especially a human one.
▸ noun:  (slang) A watch (timepiece).
▸ noun:  (birdwatching, slang) A birdwatcher who aims to see (and tick off on a list) as many bird species as possible.

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