1.
that (over there, modifying a noun)
A demonstrative adjective used before nouns to indicate something far from both speaker and listener.
2.
um, well (hesitation)
Used as a filler word when hesitating or getting someone's attention.
あの has two distinct uses: demonstrative and interjection.
SENSE 1 — DEMONSTRATIVE:
Modifies nouns to indicate something distant from both speaker and listener. Part of the こ・そ・あ・ど system:
あの can also refer to shared knowledge — something both speaker and listener know about, even if not physically present: あの映画 (that movie [we both know]).
SENSE 2 — INTERJECTION:
Used as a polite filler when hesitating or getting someone's attention, similar to "um" or "excuse me" in English. Often drawn out as あのー for a softer, more tentative tone.