The inflection used to put neuter nouns into the subjective case (SD/430), used either as a suffix (for weak-nouns) or augmenting the last vowel (for strong-nouns). See the entry on the subjective case for further details.
an-prefix. intensitive prefix, intensive, intensive prefix, plu-, plus, intensive, superlative, intensive
néadverb. ago, behind (earlier time), yes (it was so)
-usuffix. dual ending