Options Trading Glossary: 40+ Essential Terms Every Trader Must Know
Options trading has its own language. Before you can read an options chain, evaluate a strategy, or understand risk, you need to speak the vocabulary fluently. This glossary covers every essential term you will encounter — from basic concepts like calls and puts to advanced topics like volatility skew and gamma risk.
New to options? Start with our Beginner's Guide for the big picture, then use this glossary as your reference. For a deep dive into the Greeks, see our Options Greeks Guide.
A
American vs European Options
American-style can be exercised any time. European-style only at expiration.
Assignment
When the option seller is forced to fulfill their obligation (sell/buy stock) because the buyer exercised.
Assignment Risk
The risk of being assigned on a short option before expiration (early assignment).
ATM (At-The-Money)
At-The-Money. Strike price is equal to current stock price.
B
Bid-Ask Spread
The difference between what buyers will pay (Bid) and what sellers want (Ask). Tight spreads = liquid options.
Buying Power
The amount of capital available to open new positions.
C
Credit
You receive money to enter the trade.
D
Debit
You pay money to enter the trade.
Delta
The amount an option price changes for a $1 move in the stock. Also a proxy for probability (0.50 Delta = ~50% chance ITM).
E
Early Exercise
When an option buyer exercises their right before expiration.
Exercise vs Assignment
Exercise is what buyers do. Assignment is what happens to sellers.
Expected Move
The market's predicted price range for a given period, derived from IV.
Extrinsic Value
The portion of an option's price above its intrinsic value — essentially what you're paying for time and uncertainty.
G
Gamma
The rate of change of Delta. High Gamma means your P&L swings wildly. Highest for ATM options near expiration.
Gamma Risk
The danger of accelerating losses when Gamma is high — typically for short options near ATM as expiration approaches.
Greeks
The five key risk measurements: Delta, Gamma, Theta, Vega, and Rho.
I
Implied Move
The expected price move around a specific event, extracted from option prices.
Implied Volatility (IV)
Implied Volatility. The market's forecast of a likely movement range. High IV = Expensive options.
Intrinsic Value
The real, tangible value of an option — the amount it's in-the-money. A $100 Call on a $110 stock has $10 of intrinsic value. OTM options have zero intrinsic value.
ITM (In-The-Money)
In-The-Money. An option that has intrinsic value.
IV Percentile
The percentage of days over the past year that IV was below the current level.
IV Rank
Where current IV sits relative to its 52-week range, expressed as a percentile (0-100).
L
LEAP
Long-Term Equity Anticipation Security. Options expiring in >1 year.
M
Margin Requirement
The cash or collateral your broker requires to hold when selling options.
Moneyness
Describes an option's relationship to the current stock price.
O
Open Interest
The total number of outstanding option contracts that haven't been closed or exercised.
OTM (Out-Of-The-Money)
Out-Of-The-Money. An option with no intrinsic value, consisting only of time value.
P
Pin Risk
The danger that a stock closes right at your short strike at expiration.
Premium
The market price of the option contract.
Probability of Profit (POP)
The statistical likelihood a trade will make at least $0.01 at expiration.
Put-Call Parity
A fundamental pricing relationship: Call Price - Put Price = Stock Price - PV(Strike Price). For short-dated options where the present value discount is negligible, this simplifies to C - P ≈ S - K.
R
Rho
Sensitivity to interest rates. Usually minor unless trading LEAPS.
S
Strike
The specific price at which the option holder can buy (Call) or sell (Put) the stock.
T
Theta
Time decay. The amount of value the option loses every day as it approaches expiration.
Theta Decay
Daily erosion of extrinsic value. Accelerates exponentially in final 30 days.
Time Value
Synonym for extrinsic value. The 'hope premium' reflecting the possibility that the option could become more valuable before expiration.
V
Vega
Sensitivity to Implied Volatility. Long Vega means you profit if IV rises (fear increases).
Volatility Skew
The pattern where OTM puts are priced higher (higher IV) than equidistant OTM calls.
Volatility Smile
A U-shaped curve showing that both deep OTM puts and deep OTM calls have higher IV than ATM options.
Volume
The number of contracts traded during the current session.
The Jungle Perspective
In the Wall Street Jungle, vocabulary is survival. Every animal species has calls and signals that the uninitiated cannot distinguish — a warning screech versus a mating call sounds the same to outsiders. Options terminology works the same way. When you hear "the skew is steep and IV Rank is at 85," you need to instantly know that means OTM puts are expensive and overall volatility is elevated — a prime environment for selling premium. The traders who thrive in the jungle are not necessarily the smartest — they are the ones who speak the language fluently enough to act before the opportunity disappears.