Of an appropriate or pertinent nature.
by the way, incidental
Regarding or concerning.
To the purpose; appropriately.
By the way.
Timely; at a good time.
Relating to, or having a theme (“subject”) or a topic.
Relating to a melodic subject.
Of or relating to a theme (“subdivision of the Byzantine empire”).
Of a word stem, ending in a vowel that appears in or otherwise influences the noun or verb's inflection.
A postage stamp that is part of a thematic collection.