a A1

/æɪ/ used before a noun to refer to one person or thing that is not specific or not already known

an A1

/ˈæn/ The form of "a" used before words that begin with a vowel sound; refers to one person or thing not already mentioned.

across A2

/əˈkɹɔs/ from one side of something to the other

onliness C2+

/ˈoʊnlinəs/ the state of being alone or unique; singleness

oneness C2+

/ˈwʌnnəs/ the state of being unified, whole, or in complete harmony