Every market has its own vocabulary, and trading vocabulary is denser than most. Open any broker app and you’ll see terms used as if they’re self-evident — spread, slippage, drawdown, leverage, AFSL — when in fact each one carries specific meaning that affects your decisions. This is the working glossary every Australian trader should have on hand: thirty terms grouped by category, explained in plain English, with examples grounded in the Australian market. Bookmark it, return when you need it, and you’ll cut through three quarters of the marketing language you encounter.
Market mechanics
1. Bid
The highest price a buyer is currently willing to pay for an asset. If you want to sell at market right now, you’ll get the bid price.
2. Ask (or Offer)
The lowest price a seller is currently willing to accept. If you want to buy at market right now, you’ll pay the ask price.
3. Spread
The difference between the bid and the ask. A tighter spread is cheaper for traders; a wider spread costs more on entry and exit. ASX 200 stocks usually have spreads of a cent or two; less liquid stocks can have spreads of several cents.
4. Slippage
The gap between the price you expected and the price you actually filled at. A market order during a fast-moving release can slip several percent on a volatile crypto pair.
5. Liquidity
How easily an asset can be traded without moving the price. CBA shares are highly liquid. A small-cap microcap is illiquid — a meaningful order moves the price against you.
6. Order book
The list of resting buy and sell orders at different price levels. Depth of the order book tells you how much volume can transact before the price moves.
Order types
7. Market order
An order to buy or sell immediately at the best available price. Fills quickly but exposes you to slippage in volatile conditions.
8. Limit order
An order to buy or sell at a specified price or better. You control the price but the order may not fill if the market doesn’t reach your limit.
9. Stop-loss
An order that triggers a market sell (or buy, if you’re short) when the price reaches a level you set. Used to cap losses on a losing trade.
10. Take-profit
An order that triggers a sale at a pre-set profit level, locking in the gain without you needing to watch the screen.
Risk and performance
11. Drawdown
The peak-to-trough decline in your account or a strategy’s equity curve. Maximum drawdown is the worst such decline historically — a key risk metric.
12. Sharpe ratio
Return per unit of volatility. Higher is better. Above 1.0 is decent, above 2.0 is excellent, above 3.0 should make you suspicious unless audited.
13. Position sizing
How much capital you commit to a single trade. Sensible position sizing — typically risking 0.5% to 2% of account per trade — is the single most important risk control retail traders have.
14. Leverage
Trading with borrowed capital to amplify exposure. ASIC caps retail forex leverage at 30:1, indices at 20:1, commodities at 10:1, shares at 5:1, and crypto CFDs at 2:1.
15. Margin
The capital you put up as collateral against a leveraged position. A margin call is when your account drops below the required level and you must add capital or close positions.
Instruments
16. CFD (Contract for Difference)
A derivative that pays the difference between the entry and exit price of an underlying asset. You don’t own the underlying. CFDs allow leveraged trading but lose-or-keep statistics show most retail CFD accounts lose money.
17. ETF (Exchange-Traded Fund)
A fund that trades on an exchange like a single stock, but holds a basket of underlying assets. Broad-market ETFs are the most popular Australian retail investment.
18. Spot
Buying or selling an asset for immediate delivery and ownership. Spot Bitcoin means you hold the actual coin, not a derivative tracking its price.
19. Perpetual (or Perp)
A crypto futures contract with no expiry date, kept in line with spot through a funding rate that’s paid periodically between longs and shorts.
20. Stablecoin
A cryptocurrency designed to hold a stable value, usually pegged 1:1 to a fiat currency like USD. USDC, USDT, and AUDC are common examples Australian traders encounter.
Regulation and tax
21. AFSL (Australian Financial Services Licence)
The licence issued by ASIC that authorises a business to provide financial services in Australia. Brokers, fund managers, financial planners, and now crypto platforms all require an AFSL or to operate under one.
22. ASIC
The Australian Securities and Investments Commission — the primary financial regulator overseeing markets, financial services, and consumer credit in Australia.
23. AUSTRAC
Australia’s anti-money-laundering and counter-terrorism-financing regulator. Crypto exchanges operating in Australia must register with AUSTRAC.
24. AFCA
The Australian Financial Complaints Authority — the external dispute-resolution scheme that all AFSL holders must belong to. If a platform isn’t an AFCA member, that’s a serious warning sign.
25. CGT (Capital Gains Tax)
Tax on the gain from disposing of a CGT asset. Held more than twelve months as an individual investor and the 50% CGT discount applies — though this is being scrapped from July 2027.
Market and macro vocabulary
26. Cash rate
The interest rate set by the Reserve Bank of Australia for overnight loans between banks. The benchmark for the cost of money in the Australian economy. Currently 4.35% in May 2026.
27. Trimmed mean inflation
The underlying inflation measure the RBA targets, calculated by stripping out the most volatile price changes from headline CPI. See our dedicated explainer.
28. Sector rotation
Capital flowing out of one part of the market and into another in response to macroeconomic shifts. Rate cycles drive sector rotations more reliably than almost any other factor.
29. Volatility
How much the price of an asset moves over time. Higher volatility means larger swings. Useful for traders; uncomfortable for investors.
30. AEST
Australian Eastern Standard Time — the time zone Sydney, Melbourne, and Brisbane operate in for most of the year. AEDT applies during Daylight Saving from October to April for the southern states. See our guide to trading hours in AEST.
The takeaway
Thirty terms isn’t enough to cover every concept in trading. It is enough to ensure you don’t get lost reading a broker’s onboarding screens, an RBA statement, or a financial press article. Bookmark this page, share it with someone newer than you, and refer back when you need it.
For deeper coverage on the regulatory framework around financial services in Australia, see our piece on ASIC rules for AI trading platforms. For more on the algorithmic context behind modern market mechanics, see why 85% of ASX trades are now algorithmic. To see how Impulse Cashholm’s platform handles the practical side of these concepts, visit How It Works or the FAQ.
Definitions are simplified for accessibility. Trading and investing involve risk, including the possible loss of capital. Information on this page is general in nature and does not constitute financial advice.