Perhaps a short form of expandable object.



expando (plural expandos)

  1. (computing, programming) A property added to an object at run-time.
    • 2009, Ted Pattison, Daniel Larson, Inside Microsoft Windows Sharepoint Services 3.0
      Because JavaScript objects are not constrained to predefined interfaces as they are with .NET objects, you can set expando properties on any object.
    • 2010, Alexei White, JavaScript Programmer's Reference
      I talk more about expandos in Chapter 10. This means that you can arbitrarily add new properties to an object whenever you want.

See alsoEdit



From ex- (out) +‎ pandō (spread).



expandō (present infinitive expandere, perfect active expandī, supine expansum); third conjugation

  1. I spread out
  2. I expand
  3. I explain


  • expans- is sometimes expass-
   Conjugation of expando (third conjugation)
indicative singular plural
first second third first second third
active present expandō expandis expandit expandimus expanditis expandunt
imperfect expandēbam expandēbās expandēbat expandēbāmus expandēbātis expandēbant
future expandam expandēs expandet expandēmus expandētis expandent
perfect expandī expandistī expandit expandimus expandistis expandērunt, expandēre
pluperfect expanderam expanderās expanderat expanderāmus expanderātis expanderant
future perfect expanderō expanderis expanderit expanderimus expanderitis expanderint
passive present expandor expanderis, expandere expanditur expandimur expandiminī expanduntur
imperfect expandēbar expandēbāris, expandēbāre expandēbātur expandēbāmur expandēbāminī expandēbantur
future expandar expandēris, expandēre expandētur expandēmur expandēminī expandentur
perfect expansus + present active indicative of sum
pluperfect expansus + imperfect active indicative of sum
future perfect expansus + future active indicative of sum
subjunctive singular plural
first second third first second third
active present expandam expandās expandat expandāmus expandātis expandant
imperfect expanderem expanderēs expanderet expanderēmus expanderētis expanderent
perfect expanderim expanderīs expanderit expanderīmus expanderītis expanderint
pluperfect expandissem expandissēs expandisset expandissēmus expandissētis expandissent
passive present expandar expandāris, expandāre expandātur expandāmur expandāminī expandantur
imperfect expanderer expanderēris, expanderēre expanderētur expanderēmur expanderēminī expanderentur
perfect expansus + present active subjunctive of sum
pluperfect expansus + imperfect active subjunctive of sum
imperative singular plural
first second third first second third
active present expande expandite
future expanditō expanditō expanditōte expanduntō
passive present expandere expandiminī
future expanditor expanditor expanduntor
non-finite forms active passive
present perfect future present perfect future
infinitives expandere expandisse expansūrus esse expandī expansus esse expansum īrī
participles expandēns expansūrus expansus expandendus
verbal nouns gerund supine
nominative genitive dative/ablative accusative accusative ablative
expandere expandendī expandendō expandendum expansum expansū







  1. First-person singular (yo) present indicative form of expandir.