اتن doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• أَتَنَ Form 1

  1 أَتَنَ بِالمَكَانِ ذ , (S, M, Msb, K, *) aor. اَتُنَ , (Msb,) or اَتِنَ , (K,) inf. n. أُتُونٌ (M, Msb, K) and أَتُنٌ, (K,) He remained, continued, stayed, or abode, in the place; (S, M, Msb, K; *) or became fixed, or …

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• اتنّ Form 4

  4 اتنّ أتان أتن اتن , (K,) inf. n. إِتْنَانٌ, (TA,) He, or it, was, or became, distant, or remote. (K.) -A2- اتنّهُ It (a disease) stunted him, (AZ, IAar, T, S, M, K,) namely, a child, or boy, (IAar, T, S, M, K,) so that…

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