
eineinhalb
one and a half
Refers to the number 1.5; one plus half of one.
Der Film dauert eineinhalb Stunden.
The film lasts one and a half hours.
one and a half
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one and a half
Refers to the number 1.5; one plus half of one.
Der Film dauert eineinhalb Stunden.
The film lasts one and a half hours.
The word 'eineinhalb' (one and a half) is made up of 'ein', 'ein', and 'halb'. This pattern also works for other numbers, for example 'zweieinhalb' (2.5) or 'dreieinhalb' (3.5).
Die Wanderung dauerte zweieinhalb Stunden.
The hike lasted two and a half hours.
Although the word begins with 'ein-', the following noun is always plural. So it is 'eineinhalb Stunden' (one and a half hours), not 'eineinhalb Stunde'.
Ich warte schon seit eineinhalb Stunden auf den Bus.
I've been waiting for the bus for one and a half hours already.
The numeral 'eineinhalb' (one and a half) is not declined. It always keeps its basic form, regardless of which case it is in.
Nach eineinhalb Jahren in Deutschland spricht sie fließend Deutsch.
After one and a half years in Germany, she speaks fluent German.
one and a half
Anderthalb and eineinhalb refer to the same amount: one and a half, or 1.5. Based on the meanings given, there is no difference in meaning. Both forms therefore work with the same quantity, for example when referring to a duration or number.

Die Fahrt dauert eineinhalb Stunden.
The journey takes one and a half hours.
Die Fahrt dauert anderthalb Stunden.
The journey takes one and a half hours.