Tự động, tự ý

to make a spontaneous offer of one's services

tự ý xung phong phục vụ

Tự phát, tự sinh

spontaneous development

sự phát triển tự phát

spontaneous generation

sự tự sinh

Thanh thoát, tự nhiên, không ép buộc, không gò bó, không ngượng ngập (văn..)

a spontaneous gaiety of manner

một thái độ vui vẻ không gò bó

tự phát, tức phát

tức thời

spontaneous combustion

sự cháy tức thời

spontaneous ignition

sự đốt cháy tức thời

spontaneous magnetization

sự từ hóa tức thời

Unannounced, unpremeditated, unplanned, impromptu,extemporaneous, extempore, unprepared, unrehearsed, offhand, adlib, spur-of-the-moment, Colloq off the cuff: Miss Malkin'sspontaneous speech could not have been better had it beenwritten out. 2 natural, unforced, unbidden, instinctive,instinctual, unconscious, reflex, automatic, mechanical,immediate, offhand, unguarded, unthinking, unwitting,involuntary, impetuous, impulsive, Slang knee-jerk: How couldyou doubt the sincerity of such an outburst of spontaneousaffection? My spontaneous reaction is to beg you not to take upsky-diving.

Acting or done or occurring without external cause.

Voluntary, without external incitement (made a spontaneous offerof his services).

Biol. (of structural changes in plants andmuscular activity esp. in young animals) instinctive,automatic, prompted by no motive.

(of bodily movement,literary style, etc.) gracefully natural and unconstrained.

(of sudden movement etc.) involuntary, not due to consciousvolition.

Growing naturally without cultivation.

Spontaneity n.spontaneously adv. spontaneousness n. [LL spontaneus f.sponte of one's own accord]