adjective
half, partly
A1
"Halb" primarily means "half" (a fraction) and "partly" when used adverbially. It functions as adjective or adverb and is not gradable. Special uses include time expressions ("halb zwei" = 1:30), prefix in compounds (e.g. halbherzig) and is common in everyday German speech.
Examples
Die Sitzung dauerte nur halb so lange, wie die Organisatoren geplant hatten, obwohl viele Punkte noch offen blieben.
The meeting lasted only half as long as the organizers had planned, although many points remained unresolved.
Das ist nur halb richtig.
That's only partly correct.
Ich habe nur halb gegessen.
I only ate half (of it).
Details
Mnemonics
an apple cut in half
think 'half' in English
Notes
Often used as an adverb or adjective; not typically compared.