An adverb built from the idea of continuing all the way to now
Encoding Strategies:
linguistic
todavía
still, yet
Something that has continued all the way to this moment is still happening.
Todavía estoy esperando su respuestaI'm still waiting for his reply
Todavía no hemos comidoWe haven't eaten yet
even, still (comparative)
The "still going" idea works for degree too, not just time. The thing you're comparing to was already a lot, and we're still going past that.
Tu hermana es alta, pero tú eres todavía más altaYour sister is tall, but you are even taller
Este examen fue todavía más difícil que el anteriorThis exam was still harder than the last one