Englishfor English speakers
spontaneous
Adjective
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If something is spontaneous, it happens without any outside cause; nothing else makes it happen.
He made a spontaneous offer to help the old lady cross the street.
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If something is spontaneous, it is random.
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If something is spontaneous, it happens suddenly; it happens without any warning.
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If someone does something in a spontaneous way, it is done of their own free will or without making any plan to do so.
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If something is spontaneous, it was made without being planted by humans; it is indigenous.
anisotropy
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noun
the property of being anisotropic; having a different value when measured in different directions