Definition of erratic in English:

erratic

Syllabification: er·rat·ic
Pronunciation: /iˈratik
 
/

adjective

noun

(also erratic block or boulder) Geology Back to top  
  • A rock or boulder that differs from the surrounding rock and is believed to have been brought from a distance by glacial action.
    More example sentences
    • Huge glacial erratics, boulders unlike most of the other rocks in their surroundings, stand in mute testimony to their cross-country transport by advancing ice.
    • In the absence of other sources of building stone, glacial erratics have been extensively used in Finland and northern Poland.
    • The rocks weighed about 40 kg and included two large pieces of unaltered vesicular basalt with many small attached organisms and numerous smaller rocks including a few glacial erratics.

Derivatives

erratically

Pronunciation: /-(ə)lē/
adverb
More example sentences
  • She persuaded her estranged husband to make the payments, though he does so erratically.
  • Capitalisation is often omitted or used erratically, except for names.
  • That initial enthusiasm seems to have fallen away now, and the whole system is running slowly and erratically.

erraticism

Pronunciation: /iˈratiˌsizəm/
noun
More example sentences
  • Is it a degree of erraticism to just fire your defense team, fire your security guards, then new security guards were hired, then they were fired, then a new team brought in.
  • But his brilliance was often offset by his erraticism, and this erraticism infuriated her.
  • Working for Casey was a trial for everybody, partly because of his growing erraticism and partly because of his own rightwing tendencies.

Origin

late Middle English: from Old French erratique, from Latin erraticus, from errare 'to stray, err'.

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