One of the... (أحد / إحدى)

To express "one of the..." in Arabic, use an Idafa (possessive) construction. The first word is the number "one," followed by a definite plural noun.

Always match the gender of "one" to the singular form of the noun:

  • Use the masculine أحد for masculine nouns (like فيلم "film" or كائن "creature").
  • Use the feminine إحدى for feminine nouns (like فصيلة "species" or سلحفاة "turtle").

Because this is an Idafa, the plural noun takes the genitive case. Any adjectives describing it follow the noun and match its definiteness and case as usual.

The Masculine (أحد)

The Feminine (إحدى)

Unlike أحد, which changes its ending to reflect case, إحدى ends in an alif maqsurah and does not visibly change.

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