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Maryoku (魔力): what it means in anime
魔力
まりょく · maryoku · mana; magical power Not on JLPT lists
Maryoku means "magical power" or "mana", the resource a mage spends to cast spells. Frieren's mages measure it, hide it and run out of it.
Where you hear it 2 of 42 series
Lines from the Japanese subtitles of episodes 1–3 of each show. A translation is shown only when it clearly matches the line; counts are subtitle lines containing the word.
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Frieren · 9 lines in episodes 1–3 · this one from episode 3 · here: mana; magical power
魔力の消費も さぞ つらかろう
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Reincarnated as a Slime · 6 lines in episodes 1–3 · this one from episode 2
魔力が底をつくと どうなる？
Usage and nuance
It is 魔 (magic, demon) plus 力 (power). Frieren introduces 魔力 as something demons and mages can sense, and a key plot point is that she suppresses hers. Tensura uses it as the stat behind every skill.
Phrases: 魔力が切れた is "out of mana", 魔力を感じる is "to sense magic power", 魔力量 is one's total pool. Game-literate viewers will recognise MP.
Compare 能力 (nouryoku, ability) and 力 (chikara, strength). 魔力 is specifically the magical kind, never physical.
Hear 魔力 in Frieren9 lines in episodes 1–3 · tappable subtitles · free, no account