Idols are considered Minions as well as summoned minions.

Allies are basically everything on your team, You, Demigods (and even minions and idols I'm fairly sure)

Army is your army, so I'm fairly sure it includes you and your minions (including idols).

Minion buffs and such arent very transparent so I don't know for sure, I'll have to look into it. Or you could

excellent questions!

I know "minions" applies to idols and summoned minions.  It's important to observe that most of the minion boost Skills for the Generals only applies to summoned minions (because they are specifically named)  Only morale also applies to idols.

I'm pretty sure "Allies" applies to everything on your team.  Yourself, Your Minions, Friendly creeps, Friendly DGs, Friendly DGs minions.

The only one I'm not clear about is "your army."  I think it's the same as allies.  But I'm not positive.  It may just mean your creeps or your minions and your creeps.

Hope that hleps.

"Minions" refers to a General's summoned minions; token ones and summoned ability ones.

"Allies" refers to all on your team (minus buildings).  So, by that it means Reinforcements (also known as "Creeps"), Partner Demigods, and all Minions that are on your team.  So, Sedna's Healing Wind ability effects all team units within the area around her (which it's suggested that she follows groups of creeps throughout the entire game to progress towards the enemy Citadel).

"Army" is of the same term as Minions in that it refers to the units you summon and control (as far as I understand it).  Queen of Thorn's ability Godess of Thorns effects her Minions and that's all.

Sedna's Magificent Presence ability effects allys's ability cooldowns near her is what the ability means, the minion effects of the ability itself only effect Sedna.