It is a fairly established terminology in mathematics and programming that one can "index a variable", in the sense of appending a dimension of variability to it (e.g. here and here, respectively). Wiktionary captures index as a verb too.
I am looking for a verb that expresses the contrary action, i.e. to remove an index. Wiktionary includes the verbs "deindex" and "unindex" (as synonymous), albeit with the following definition:
- (computing, finance) To remove from an index.
I highlight the "from" preposition, because it shows that definition is not exactly what I'm looking for. I want to remove an index from a variable, and not remove a component of an index (e.g. remove a stock from a stock exchange index).
And yet, the adjective "unindexed" exists, and it is used precisely in the meaning of "not having an index" (e.g. here). Given that "indexed" is the past participle of the verb "to index", we could similarly think of "unindexed" as the past participle of the verb "to unindex", and thus append the meaning of "unindexed" to that verb, thereby validating my desired meaning.
To provide more context, consider a multidimensional variable X, which varies across individuals (indexed as i) and over time (indexed as t). For example, income. In mathematical notation, this is represented as Xit.
I am writing the following phrase:
We cannot eliminate t from Xit unless ...
I would like to use instead:
We cannot unindex t from Xit unless ...