different between expand vs obturation

English

Etymology

Recorded in Middle English since 1422 (as expanden, expaunden), from Anglo-Norman espaundre, from Latin expandere present active infinitive of expand? (“to spread out”), itself from ex- (“out, outwards”) + pand? (“to spread”). Doublet of spawn.

Pronunciation

• Rhymes: -ænd
• IPA^(key): /?k?spænd/

Verb

expand (third-person singular simple present expands, present participle expanding, simple past and past participle expanded)

1. (transitive) To change (something) from a smaller form or size to a larger one; to spread out or lay open.

2. (transitive) To increase the extent, number, volume or scope of (something).
3. (transitive) To express (something) at length and/or in detail.
4. (transitive, algebra) To rewrite (an expression) as a longer, yet equivalent sum of terms.

5. (intransitive, algebra, of an expression) To become, by rewriting, a longer, yet equivalent sum of terms.

6. (transitive, arithmetic) To multiply both the numerator and the denominator of a fraction by the same natural number yielding a fraction of equal value
7. (intransitive) To change or grow from smaller to larger in form, number, or size.

8. (intransitive) To increase in extent, number, volume or scope.
9. (intransitive) To speak or write at length or in detail.
10. (intransitive) To feel generous or optimistic.

Synonyms

• (to change from a smaller form/size to a larger one): open out, spread, spread out, unfold
• (to increase the extent, number, volume or scope of): enlarge
• (to express at length or in detail): elaborate (on), expand on

Antonyms

• (to change from a smaller form/size to a larger one): contract
• (to increase the extent, number, volume or scope of): contract
• (algebra: to rewrite as an equivalent sum of terms): factor

Derived terms

• expandable
• expander

Related terms

• expanse
• expansible
• expansile
• expansive
• expansion
• expansionism

Translations

English

Etymology

From Latin obturare (“to stop up”): compare French obturation.

Noun

obturation (countable and uncountable, plural obturations)

1. The act of stopping up, or closing, an opening.

   • Deaf by an outward obturation.

2. (firearms) The process of a bullet expanding under pressure to fit the bore of the firearm, or a cartridge case expanding under pressure to seal the chamber.

Related terms

• obturate
• obturative

French

Pronunciation

Noun

obturation f (plural obturations)

1. sealing; closing up
2. blockage
3. a dental filling

Derived terms

• vitesse d'obturation

Further reading

• “obturation” in Trésor de la langue française informatisé (The Digitized Treasury of the French Language).