An unaugmented (mujarrad) verb has no extra derivational consonants beyond its basic root pattern, as in نَصَرَ (faʿala).
An augmented (mazīd fīhi) verb adds one or more letters to the root within a derived stem.
اِجْتَنَبَ comes from j-n-b with added i- and -t- in its stem.
اِسْتَنْصَرَ comes from n-ṣ-r with the prefixed ist- sequence.
Augmentation may modify the meaning, but a derivational pattern does not guarantee one mechanical translation for all roots.
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Unaugmented and augmented forms
Verb Classes and the Six Unaugmented Triliteral Patterns
An unaugmented (mujarrad) verb has no extra derivational consonants beyond its basic root pattern, as in نَصَرَ (faʿala).
An augmented (mazīd fīhi) verb adds one or more letters to the root within a derived stem.
اِجْتَنَبَ comes from j-n-b with added i- and -t- in its stem.
اِسْتَنْصَرَ comes from n-ṣ-r with the prefixed ist- sequence.
Augmentation may modify the meaning, but a derivational pattern does not guarantee one mechanical translation for all roots.