Regarding or concerning.
To the purpose; appropriately.
By the way.
Timely; at a good time.
Of an appropriate or pertinent nature.
by the way, incidental
For each.
In accordance with, as per
By the, by means of the, via the, through the.
To each, in each (used in expressing ratios of units).
They (singular). Gender-neutral neologistic third-person singular subject pronoun, coordinate with gendered pronouns he and she.
Them (singular) Neologistic gender-neutral third-person singular object pronoun, suggested for use in place of him and her.
Belonging to per, their (singular). Gender-neutral third-person singular possessive adjective, coordinate with gendered his and her.