Quick answer
Ascender rises; acender produces light or flame.
A reliable test is to identify the job of the word before translating from English.
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What each word does
ascender
to ascend or be promoted
Use ascender for moving upward in space, rank, status, or importance.
acender
to light or switch on
Use acender for starting a flame, light, or device, or making it glow.
How to choose
- ascender: Choose ascender if the sentence points to moving upward in space, rank, status, or importance.
- acender: Choose acender if the sentence points to starting a flame, light, or device, or making it glow.
Examples
Ela ascendeu ao cargo de diretora.
She rose to the position of director.
O técnico acendeu a luz de emergência.
The technician switched on the emergency light.
Common trap
The noun ascensão belongs to advancement. The noun acendimento belongs to switching or lighting something.
Practice it in context
Pick one sentence from your real life and write it twice: once with ascender, then once with acender. If both versions feel possible, name the meaning shift.
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