Science & Research — C1 Essential Words
Ten essential C1 words (Science) with the complete apparatus: pronunciation, simple definitions, natural American examples, collocations, family, the common mistake and spoken usage — plus a 15-question practice quiz. Mark your status on every word.
observe /əbˈzɜːrv/ verb C1 Science
Meaning: To watch something carefully over time in order to learn about it; to notice something.
Example: Students observe the plants every day and record changes.
Another example: Astronomers observed a new comet last night.
Collocations: observe carefully · observe behavior · observe that
Synonyms: watch, monitor, note
Antonyms: ignore, overlook
Word family: observation (n) · observer (n) · observable (adj)
⚠ Common mistake: Observe is watch-with-a-purpose (science); plain watching TV is just watch. Findings follow 'observe that…'.
🗣 In spoken American English: Lab reports begin with it: observe first, conclude later.
Register: Formal — science reports core.
hypothesis /haɪˈpɒθəsɪs/ noun C1 Science
Meaning: An idea or explanation that can be tested through experiments and observation.
Example: Their hypothesis was that light helps seeds grow faster.
Another example: The experiment supported the hypothesis.
Collocations: test a hypothesis · hypothesis that · working hypothesis
Synonyms: theory (proven more), prediction, idea
Word family: hypotheses (n pl — irregular) · hypothetical (adj)
⚠ Common mistake: A hypothesis is TESTABLE and unproven; a theory has survived many tests. Plural: hypotheses — exam favorite.
🗣 In spoken American English: Every science-fair poster starts with one: 'My hypothesis is…'
Register: Formal — academic core.
variable /ˈveəriəbəl/ noun / adjective C1 Science
Meaning: A factor that can change in an experiment; (adjective) not constant, able to change.
Example: Temperature is the key variable in this experiment.
Another example: Spring weather is variable here.
Collocations: control variables · independent variable · variable costs
Synonyms: factor, element, condition
Antonyms: constant
Word family: variables (n pl) · vary (v) · variation (n)
⚠ Common mistake: Experiments CHANGE one variable and MEASURE another while controlling the rest — the heart of the method.
🗣 In spoken American English: Spreadsheets named their cells after it — variables hold values everywhere in tech too.
Register: Formal — science and math staple.
sample /ˈsæmpəl/ noun C1 Science
Meaning: A small amount or group taken from something larger, used to study or test the whole.
Example: Doctors tested a blood sample.
Another example: The survey used a sample of 2,000 voters.
Collocations: sample size · blood sample · random sample
Synonyms: specimen, example, subset
Word family: sampling (n) · sample (v)
⚠ Common mistake: A sample must REPRESENT the whole — that's why 'random sample' matters in polls and studies.
🗣 In spoken American English: Shops use the twin meaning: a free sample is a taste of the product.
Register: Neutral to formal — research essential.
procedure /prəˈsiːdʒər/ noun C1 Science
Meaning: An official or standard way of doing something, with steps in a fixed order.
Example: Follow the safety procedure exactly.
Another example: The surgery is a common procedure.
Collocations: safety procedure · standard procedure · follow a procedure
Synonyms: process, method, protocol
Word family: procedures (n pl) · procedural (adj)
⚠ Common mistake: Procedure = the STEPS in order. Medical use: an operation is 'a procedure'. Labs and airports both live by them.
🗣 In spoken American English: 'Standard procedure' calms people: it means 'this is normal, nothing is wrong'.
Register: Formal — science, medicine, offices.
evaluate /ɪˈvæljueɪt/ verb C1 Science
Meaning: To judge the quality, importance, or value of something carefully.
Example: Teachers evaluate students' progress each term.
Another example: We need to evaluate the risks before investing.
Collocations: evaluate the results · evaluate performance · carefully evaluate
Synonyms: assess, judge, appraise
Antonyms: ignore, assume
Word family: evaluation (n) · evaluator (n)
⚠ Common mistake: Evaluate is deeper than check: it judges VALUE with criteria. Its noun, evaluation, fills reports.
🗣 In spoken American English: Job life runs on 'performance evaluations' every year.
Register: Formal — academic and HR core.
finding /ˈfaɪndɪŋ/ noun C1 Science
Meaning: A piece of information discovered through research or an official investigation.
Example: The study's main finding surprised everyone.
Another example: The committee published its findings on Friday.
Collocations: key finding · findings of the study · report findings
Synonyms: result, discovery, conclusion
Word family: findings (n pl) · find (v)
⚠ Common mistake: Findings are usually plural in reports: 'the findings show…'. One fact = a finding.
🗣 In spoken American English: News formula: 'The study's findings suggest…' — the polite way to report science.
Register: Formal — research reporting essential.
component /kəmˈpəʊnənt/ noun C1 Science
Meaning: One part of a larger machine, system, or idea.
Example: Trust is a key component of any team.
Another example: The phone's components come from five countries.
Collocations: key component · component of · main components
Synonyms: part, element, ingredient
Antonyms: whole
Word family: components (n pl)
⚠ Common mistake: Component is the engineer's word for part — systems are built FROM components. Abstract ideas have components too.
🗣 In spoken American English: Product teardowns list them; recipes call the same things ingredients.
Register: Formal — tech and science staple.
significant /sɪɡˈnɪfɪkənt/ adjective C1 Science
Meaning: Important or large enough to matter; in statistics, unlikely to be caused by chance.
Example: The study found a significant improvement in scores.
Another example: Her work made a significant difference.
Collocations: significant difference · significant increase · statistically significant
Synonyms: important, notable, major
Antonyms: insignificant, minor, trivial
Word family: significance (n) · significantly (adv)
⚠ Common mistake: Two strengths: general 'important' and the statistician's exact sense. Never 'very significant' in stats writing — it either is or isn't.
🗣 In spoken American English: Reports love the soft phrase: 'a significant number of people' — many, but uncounted.
Register: Formal — academic core adjective.
analysis /əˈnæləsɪs/ noun C1 Science
Meaning: The careful examination of something's parts to understand it better.
Example: A data analysis revealed the pattern.
Another example: The report includes an analysis of the causes.
Collocations: data analysis · analysis of · detailed analysis
Synonyms: examination, study, breakdown
Word family: analyses (n pl — irregular) · analyze (v) · analyst (n)
⚠ Common mistake: Plural is analyses (a-NAL-uh-seez). You do an analysis OF something; analysts analyze data.
🗣 In spoken American English: Every field hires them: data analyst, business analyst, security analyst.
Register: Formal — reports essential.
Practice — Science & Research
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