An example of when the word am would be used is when saying you are having dinner.
An example of a.m. is 10 a.m. which means ten o'clock in the morning.
Origin of am
- Middle English from Old English eom es- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
- From Middle English am, em, from Old English eam, eom (“am”), from Proto-Germanic *immi, *izmi (“am”), from Proto-Indo-European *h₁ésmi (“I am, I exist”), a form of the verb *wesaną. Cognate with Old Norse em, emi (“am”), Gothic (im, “am”), Ancient Greek εἰμί (eimi), Albanian jam (“I am”), Sanskrit अस्मि (ásmi).
- A representation of the pronunciation of ham by a speaker whose dialect lacks the voiceless glottal fricative or transition (IPA: [h]).