metamorphosis

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metamorphosis [noun]

a complete change

US /ˌmet̬.əˈmɔːr.fə.sɪs/ 
UK /ˌmet.əˈmɔː.fə.sɪs/ 

دگرگونی، تغییر

مثال: 

Caterpillars go through a metamorphosis to became butterflies.

Longman Dictionary of Contemporary English

metamorphosis

metamorphosis /ˌmetəˈmɔːfəsəs, ˌmetəˈmɔːfəsɪs $ -ˈmɔːr-/ BrE AmE noun (plural metamorphoses /-siːz/) [uncountable and countable]
[Date: 1500-1600; Language: Latin; Origin: Greek, from meta- ( ⇨ ↑meta-) + morphe 'shape']
1. formal a process in which something changes completely into something very different SYN transformation:
It took me some time to undergo the metamorphosis from teacher to lecturer.
the metamorphosis of China under Deng’s economic reforms
2. a process in which a young insect, ↑frog etc changes into another stage in its development:
Beetles undergo a complete metamorphosis in their life cycle.

Oxford Advanced Learner's Dictionary

metamorphosis

meta·mor·phosis [metamorphosis metamorphoses]   [ˌmetəˈmɔːfəsɪs]    [ˌmetəˈmɔːrfəsɪs]  noun (pl. meta·mor·phoses   [ˌmetəˈmɔːfəsiːz]  ;   [metəˈmɔːrfəsiːz]  ) countable, uncountable (formal)
a process in which sb/sth changes completely into sth different
Syn:  transformation
the metamorphosis of a caterpillar into a butterfly
She had undergone an amazing metamorphosis from awkward schoolgirl to beautiful woman.  
Word Origin:
late Middle English: via Latin from Greek metamorphōsis, from metamorphoun ‘transform, change shape’.  
Example Bank:

• We studied the metamorphosis of a caterpillar into a butterfly.

Cambridge Advanced Learner's Dictionary

metamorphosis / ˌmet.əˈmɔː.fə.sɪs /   / ˌmet̬.əˈmɔːr- / noun ( plural metamorphoses )

[ C ] a complete change:

Under the new editor, the magazine has undergone a metamorphosis.

[ U ] specialized the process by which the young form of insects and some animals, such as frogs, develops into the adult form

Collins Advanced Learner’s English Dictionary

metamorphosis

/metəmɔ:(r)fəsɪs/
(metamorphoses)

When a metamorphosis occurs, a person or thing develops and changes into something completely different. (FORMAL)
...his metamorphosis from a republican to a democrat...

= transformation

N-VAR

Merriam-Webster's Advanced Learner's Dictionary

metamorphosis
meta·mor·pho·sis /ˌmɛtəˈmoɚfəsəs/ noun, pl -pho·ses /-fəˌsiːz/
1 : a major change in the appearance or character of someone or something

[count]

• We have watched her metamorphosis from a shy schoolgirl into a self-confident businesswoman.
• a company that has gone through a series of metamorphoses

[noncount]

• The government has undergone political metamorphosis since his election.
2 biology : a major change in the form or structure of some animals or insects that happens as the animal or insect becomes an adult

[noncount]

• the metamorphosis of tadpoles into frogs
• The class learned about how caterpillars undergo metamorphosis to become butterflies.

[count]

• caterpillars undergoing metamorphoses