Ha

Multiple Entries:
  ha    hectare  

Concise Oxford English Dictionary © 2008 Oxford University Press:
ha1 (also hah)

▶exclamation expressing surprise, suspicion, triumph, etc.

– origin natural utterance: first recorded in ME.

Concise Oxford English Dictionary © 2008 Oxford University Press:
ha2

▶abbreviation hectare(s).

Concise Oxford English Dictionary © 2008 Oxford University Press:
hectare /ˈhɛktɛː, -ɑː/ (abbrev.: ha)

▶noun a metric unit of square measure, equal to 10,000 square metres (2.471 acres).

– derivatives
hectarage noun.

– origin C19: from Fr., from Gk hekaton ‘hundred’ + are2.