different between irreversible vs obligatory

English

Etymology

From ir- +? reversible.

Adjective

irreversible (not comparable)

1. Incapable of being reversed or turned about or back; incapable of being made to run backward.

2. Incapable of being reversed, recalled, repealed, or annulled.
3. (thermodynamics) Incapable of being reversed to the original state without consumption of free energy and increase of entropy.

Related terms

• irreversibility

Translations

Catalan

Etymology

From ir- +? reversible.

Pronunciation

• (Balearic) IPA^(key): /i.r?.v???si.bl?/
• (Central) IPA^(key): /i.r?.b?r?si.bl?/
• (Valencian) IPA^(key): /i.re.ve??si.ble/

Adjective

irreversible (masculine and feminine plural irreversibles)

1. irreversible

Further reading

• “irreversible” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.

Norwegian Bokmål

Adjective

irreversible

1. definite singular/plural of irreversibel

Norwegian Nynorsk

Adjective

irreversible

1. definite singular/plural of irreversibel

Spanish

Etymology

From ir- +? reversible.

Pronunciation

• IPA^(key): /irebe??sible/, [i.re.??e??si.??le]

Adjective

irreversible (plural irreversibles)

1. irreversible (not able to be reversed)

   Antonym: reversible

Further reading

• “irreversible” in Diccionario de la lengua española, Vigésima tercera edición, Real Academia Española, 2014.

English

Etymology

From Middle English obligatorie, from Latin obligat?rius.

Pronunciation

• (US) IPA^(key): /??bl???t??i/, /??bl???t??i/
• (UK) IPA^(key): /??bl???t(?)?i/

Adjective

obligatory (comparative more obligatory, superlative most obligatory)

1. Imposing obligation, legally, morally, or otherwise; binding; mandatory.
   • 1673, Richard Baxter, Christian Directory

     […] if he speak the words of an oath in a strange language, thinking they signify something else, or if he spake in his sleep, or deliration, or distraction, it is no oath, and so not obligatory.
2. Requiring a matter or obligation.

Synonyms

• bounden
• mandatory

Antonyms

• optional

Related terms

Translations

Further reading

• obligatory in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

Middle English

Adjective

obligatory

1. Alternative form of obligatorie