contaminate
To make something dirty, unsafe, or harmful by adding unwanted material.
ExampleIndustrial waste can contaminate rivers and harm local communities.
ExampleChemicals from nearby farms contaminated the lake after heavy rain.
Usage Scenarios
Pollution source and affected place
Recognize contaminate when the passage identifies both a harmful substance and the water, soil, food, or air that becomes unsafe.
ExampleIndustrial waste can contaminate rivers and harm local communities.
Reading cause and result
After you see contaminate, look for what entered the system, how it spread, and what health or environmental result followed.
ExampleThe passage explains how chemicals contaminated the soil near the factory.
Usage Guide
Recognize contaminate when an IELTS reading passage discusses pollution and the sentence means "To make something dirty, unsafe, or harmful by adding unwanted material.". Treat it as a clue for cause, effect, process, or contrast in the paragraph.
Read or hear it with a clear noun or example nearby so you can identify exactly what the word refers to.
Do not treat contaminate as a vague topic label. In IELTS reading, identify the exact cause, effect, definition, or contrast connected to it in the passage.
Word Forms & Word Building
Contaminate is not a transparent prefix word like biodiversity. For IELTS, the useful word-building base is contaminat-, which carries the idea of making something impure or unsafe.
The final -e drops before -ion: contaminate becomes contamination. Contaminated is the adjective or past participle, as in contaminated water or contaminated soil.
Contaminant is the noun for the harmful substance itself. In reading passages, separate the contaminant, such as chemicals or bacteria, from the thing contaminated.
Meaning Boundaries
Contaminate vs pollute
Pollute is broader and often describes environmental damage in general. Contaminate focuses on making water, soil, food, air, or a sample unsafe or impure by adding a harmful substance.
Contaminate vs infect
Infect usually involves disease spreading in living bodies. Contaminate can involve bacteria, chemicals, waste, or toxins entering a material or place.
Best IELTS context
In IELTS reading, expect contaminate in passages about industrial waste, unsafe drinking water, food safety, soil pollution, laboratories, and public health.
Memory Tricks
Put contaminate in the Pollution box when you read: first identify the thing, then ask what the passage says is causing, changing, or protecting it.
Keep the phrase contaminate in your notes because IELTS reading usually tests the word inside a relationship, not alone.
Keep one sentence frame in mind, then identify the relationship in the passage: Industrial waste can contaminate rivers and harm local communities.
Common Traps
Do not use contaminate when you only mean make something messy or unattractive; the word suggests impurity, danger, or harm.
Name both sides if possible: the contaminant, such as chemicals or bacteria, and the thing contaminated, such as water, soil, or food.
Do not confuse contaminated with polluted in every context; contaminated food or a contaminated sample is more precise than polluted food.