phase
B2Neutral to formal
Definition
Meaning
a distinct stage or period in a process of development or change.
A distinguishable part in a recurring sequence or pattern; a temporary manner, attitude, or style; (physics/astronomy) a particular appearance in the cycle of a moon or planet; (electrical engineering) one of the waveforms in an alternating current system.
Linguistics
Semantic Notes
"Phase" implies a temporary, often transitional, stage within a longer, structured process. It often suggests a logical progression or sequence.
Dialectal Variation
British vs American Usage
Differences
No significant difference in core meaning. In project management, both use "phase." In electrical engineering, BrE sometimes uses "phase" for domestic supply (single-phase/three-phase), identical to AmE. Spelling: BrE uses 'phasing', AmE also uses 'phasing'.
Connotations
In both, "just a phase" can have a dismissive or minimising connotation regarding someone's temporary behaviour, especially in developmental contexts.
Frequency
Equally common in both varieties in technical and general contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
to phase something in/outto be phasedto enter/go through a phaseto reach a phasea phase of somethingVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “phase in and out”
- “just a phase (he's going through)”
- “out of phase (not synchronized)”
Usage
Context Usage
Business
Refers to stages in a project lifecycle (e.g., 'The implementation phase begins next quarter').
Academic
Used in describing processes in history, science, and psychology (e.g., 'the larval phase', 'a phase of economic expansion').
Everyday
Commonly used for personal development or temporary situations (e.g., 'My toddler is in a picky eating phase').
Technical
Crucial in physics (wave phase), astronomy (lunar phases), and engineering (three-phase power).
Examples
By Part of Speech
verb
British English
- The government will phase out petrol cars by 2035.
- New safety features are being phased in gradually.
American English
- The company phased in the software update over a week.
- They decided to phase out the old policy.
adverb
British English
- Payments will be made phase by phase.
- Not commonly used as a standalone adverb.
American English
- The project rolled out phase by phase.
- Not commonly used as a standalone adverb.
adjective
British English
- A phased withdrawal of troops was announced.
- The development is subject to a phased payment plan.
American English
- We recommend a phased approach to the merger.
- The tax cuts will be implemented in a phased manner.
Examples
By CEFR Level
- The moon has different phases.
- My little brother is in a noisy phase.
- The first phase of the building project is complete.
- She's going through a phase where she only wears black.
- The initial phase of clinical trials showed promising results.
- The government plans to phase in the new regulations over two years.
- Their relationship entered a new phase of deeper understanding.
- The two sound waves were perfectly in phase, amplifying the signal.
Learning
Memory Aids
Mnemonic
Think of the moon's changing face – each shape is a PHASE. Or: The project has to PASS through each PHASE.
Conceptual Metaphor
LIFE/DEVELOPMENT IS A JOURNEY WITH STAGES (PHASES). PROCESSES ARE CYCLES WITH PHASES.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid confusing with "фаза" in overly technical contexts when "stage" or "period" is more natural in English (e.g., 'a phase of life' not 'a фаза of life').
- The verb 'to phase' (as in phase out) has no direct single-word Russian equivalent; it means 'постепенно выводить из использования'.
Common Mistakes
- Using 'face' instead of 'phase' (spelling/pronunciation error).
- Confusing 'phase' with 'faze' (to disturb) - 'The news did not faze him.'
- Overusing 'phase' for any period without a sense of being part of a structured sequence.
Practice
Quiz
In which sentence is 'phase' used as a verb?
FAQ
Frequently Asked Questions
It is almost always countable. You go through 'a phase' or 'phases'.
They are often interchangeable, but 'phase' more strongly implies a temporary, transitional period within a cyclical or developmental process, while 'stage' can be more neutral for any distinct part of a sequence.
They are phrasal verbs. 'Phase in' means to introduce gradually. 'Phase out' means to discontinue or remove gradually. Both require an object (e.g., phase in new rules, phase out old technology).
This is a technical idiom from physics meaning synchronized or not synchronized. In general use, it can mean coordinated/not coordinated (e.g., 'Our schedules are out of phase').