STEP Hebrew Lexicon: אֶחָד

1) one (number)

1a) one (number)

1b) each, every

1c) a certain

1d) an (indefinite article)

1e) only, once, once for all

1f) one...another, the one...the other, one after another, one by one

1g) first

1h) eleven (in combination), eleventh (ordinal)