Does Ward trigger if a spell targets multiple permanents including the creature with ward?

Ward is a triggered ability that triggers whenever the permanent with ward becomes the target of a spell or ability an opponent controls (CR 702.167a). The trigger condition is simply being targeted — it does not matter whether the spell or ability also targets other permanents, players, or objects.

When a single spell targets multiple permanents and one of them has ward, ward triggers exactly once for that spell (because the creature is targeted once). The controller of the spell must pay the ward cost or the spell is countered with respect to the ward permanent only — the rest of the spell continues to resolve normally and still affects the other targets (CR 702.167b, 608.2b).

If somehow the same spell targets the ward creature more than once (e.g., via multiple target slots all pointing at the same creature), ward would trigger once for each time it is targeted (CR 702.167a).

Concrete example: Your opponent casts Shivan Meteor targeting both your Aether Channeler (which has Ward 2) and another creature. Ward triggers once. Your opponent must pay 2 or the Meteor is countered only for Aether Channeler; the other creature is still dealt damage when the spell resolves.

Key rules: Ward (CR 702.167), spell resolution with multiple targets (CR 608.2b), and countering a spell for one target only (CR 608.2b).