Definitions
1.NounOne who makes a tick mark.
2.NounA measuring or reporting device, particularly one which makes a ticking sound as the measured events occur."The ticker was showing an increased rate of flow."
3.NounA ticker tape, either the traditional paper kind or a scrolling message on a screen."I checked the prices on the ticker one last time before placing the trade.; To my surprise, the ticker showed that the deal had already gone through."
4.NounA heart, especially a human one."My ticker gave out and I had to go to the hospital for surgery."
5.NounA watch (timepiece).
6.NounA birdwatcher who aims to see (and tick off on a list) as many bird species as possible.
7.NounA beer drinker who aims to try as many different beers as possible and keeps a record of all the beers they have drunk.