obligate
C1Formal, Academic, Technical
Definition
Meaning
To bind or compel someone legally or morally to do something.
In biology, to require a specific condition or mode of life (e.g., an obligate parasite).
Linguistics
Semantic Notes
As a verb, it implies a strong, often external, compulsion (legal, contractual, biological). As an adjective, it describes an essential requirement. Less common in casual speech than 'oblige'.
Dialectal Variation
British vs American Usage
Differences
The verb is used in both varieties, but 'oblige' is more common in everyday British English. The adjective (especially in biology) is standard in both.
Connotations
In AmE, the verb is more readily used in legal/business contexts. In BrE, it can sound more formal or technical.
Frequency
Higher frequency in American English, particularly in legal and corporate documents.
Vocabulary
Collocations
Grammar
Valency Patterns
[SVO to-inf] The contract obligates the company to pay damages.[SVOC] The treaty obligates all signatories peaceful.[Passive: be obligated to do sth] You are not obligated to answer.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms with 'obligate']”
Usage
Context Usage
Business
Used in contracts and agreements: 'The clause obligates the supplier to maintain insurance.'
Academic
Common in law, ethics, and biology: 'The study focused on obligate symbiotic relationships.'
Everyday
Rare; 'obliged' or 'have to' is preferred: 'I felt obliged to help.' (Not 'obligated')
Technical
Precise term in biology: 'An obligate carnivore requires a meat-based diet.'
Examples
By Part of Speech
verb
British English
- The agreement does not obligate you to purchase further services.
- Parents are obligated by law to ensure their child's education.
American English
- The loan covenants obligate the firm to maintain a certain debt ratio.
- I feel obligated to attend since they invited me personally.
adverb
British English
- [No standard adverbial form. 'Obligatorily' is extremely rare and unnatural.]
American English
- [No standard adverbial form. 'Obligatorily' is extremely rare and unnatural.]
adjective
British English
- The tapeworm is an obligate parasite, unable to live freely.
- Certain bacteria are obligate aerobes, requiring oxygen.
American English
- The Venus flytrap is not an obligate carnivore; it can photosynthesize.
- He is an obligate smoker, needing a cigarette every hour.
Examples
By CEFR Level
- [A2 level too low for this word. Use 'must' or 'have to' instead.]
- The law obligates drivers to have insurance.
- I felt obligated to return the favour.
- The treaty obligates all member states to reduce carbon emissions.
- As an obligate carnivore, a cat cannot thrive on a vegetarian diet.
- The financiers were contractually obligated to provide the capital by quarter's end.
- His ethical framework obligated him to whistleblow, despite the personal cost.
Learning
Memory Aids
Mnemonic
Think of a legal BOND (obligate) that GATES you in, forcing you to act.
Conceptual Metaphor
SOCIAL/MORAL DEBT IS A BINDING FORCE (tied by obligation).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation from Russian 'обязывать' in casual contexts; use 'make', 'have to', or 'force'.
- Do not confuse with 'oblige' (which can mean 'do a favour') in phrases like 'much obliged'.
- The adjective 'obligate' (биол.) is a false friend of Russian 'облигатный' – it's a correct cognate but highly specific.
Common Mistakes
- Using 'obligate' casually instead of 'have to' or 'must'. (Incorrect: 'My mum obligated me to clean.' Correct: 'My mum made me clean.')
- Confusing 'obligated' (feeling compelled by duty) with 'obliged' (grateful or casually compelled).
- Misspelling as 'obligate' for the adjective form.
Practice
Quiz
In which context is the word 'obligate' MOST appropriately used?
FAQ
Frequently Asked Questions
'Obligate' is stronger and more formal, often tied to legal/moral/biological necessity. 'Oblige' can mean to compel, but also to do a favour ('I'm obliged to you'). In casual BrE, 'obliged' is common ('I felt obliged to go'), while AmE often uses 'obligated' in this sense.
Yes, primarily in scientific contexts (biology, chemistry) to describe an essential requirement, e.g., 'an obligate parasite', 'obligate anaerobe'. It is not used as a general adjective like 'necessary'.
Yes, especially in American English, as the past participle of the verb 'obligate' (e.g., 'I was obligated to pay'). Some British style guides traditionally preferred 'obliged', but 'obligated' is now widely accepted.
It belongs to a formal, specific register (legal, academic, technical). Learners at lower levels (A2-B2) can express similar meanings with more common verbs like 'force', 'make', 'require', or 'have to'. Mastering 'obligate' shows precision in advanced contexts.