Tick
The minimum upward or downward movement in the price of a security.

Investopedia Says:
Historically, stocks didn't trade in decimals. A stock would move in amounts of 1/8, 1/16, or 1/32 of a dollar (the tick). This changed when the decimal system was brought in.

Related Terms:
Basis Point
Closing Tick
Downtick
Teenie
Uptick
Zero Minus Tick
Zero Plus Tick

• Authorized Participant
• Authorized Stock
• Autocorrelation
• Automated Bond System (ABS)
• Automated Bond System (ABS)
• Automated Clearing House (ACH)
• Automated Clearing House (ACH)
• Automated Confirmation Transaction Service (ACT)
• Automated Confirmation Transaction Service (ACT)
• Automated Customer Account Transfer Service (ACATS)
• Automated Customer Account Transfer Service (ACATS)
• Automated Teller Machine (ATM)
• Automated Underwriting
• Automatic Exercise
• Automatic Investment Plan (AIP)
• Automatic Investment Plan (AIP)
• Automatic Reinvestment Plan
• Automatic Rollover
• Automatic Stabilizer
• Automatic Stay
• Autonomous Consumption
• Autonomous Expenditure
• Autoregressive
• Auto Sales
• Autotrading