ARAM - What does ARAM mean in LoL?

ARAM stands for "All random all mid." See an example of how people use it.
League of Legends (LoL) players use ARAM to refer to the All Random All Mid game mode. In this mode, players are assigned random champions (from their pool of owned champions) and forced to fight in a single lane.

ARAM - What does ARAM mean in LoL?

LoL ARAM: A Player Guide

ARAM Champion specific buffs are borderline insane : r/leagueoflegends

Why I only play League of Legends' ARAM game mode now

LoL ARAM: A Player Guide

Only aram since it's inception, what's your W/L record ? : r/ARAM

dev: ARAM Changes Wrap-Up – League of Legends

Ranking Every Champion in League of Legends ARAM

This is how the start of every ARAM should look like : r

League of Legends - ARAM Game Mode - Full Game

ARAM God Title, Experience, and Thorough Guide : r/ARAM