It is a contraction of am a wn i:
- am - for, at, since/because, as far as, (and several other meanings)
- a - that, which, who/whom (as a subject or object relative pronoun, causing a soft mutation of following word) ( not the a 'and' that you meet on this course)
- gwn i - I know (from the present tense conjugation of gwybod - not covered in this course)
- am (a) wn i - 'as far as (that) I know'
August 3, 2016