noun

• (computing) A jiffy (unit of time defined by basic timer frequency).
• (colloquial) A short period of time, particularly a second.
  "I'll be back in a tick."
• (video games) A periodic increment of damage or healing caused by an ongoing status effect.
• (gaming) Each of the fixed time periods, in a tick-based game, in which players or characters may perform a set number of actions.

verb

• (informal, intransitive) To work or operate, especially mechanically.
  "He took the computer apart to see how it ticked."
• (birdwatching, transitive) To add (a bird) to a list of birds that have been seen (or heard).

noun

• (uncountable) Ticking.

noun

• (UK, colloquial) Credit, trust.
  "When he had no funds he went on tick. When he could get no credit he went without, and was almost as happy."