imperfect_tense
1. [ noun ] (grammar) a tense of verbs used in describing action that is on-going
Synonyms: progressive_tense imperfect continuous_tense progressive
Related terms: tense future_progressive past_progressive present_progressive
Similar spelling:   imperfective
  imperfection
  imperfectness
  imperforate_hymen
  improper_fraction
  imperfectibility
  imperfectability
  imperforate_anus