(ת') שמדי פעם; מקרי; לא קבוע; ארעי

adj. occurring now and then, irregular, infrequent, incidental, on occasion

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Adjective
1. occurring from time to time; "took an occasional glass of wine"
(synonym) occasional(a)
(similar) infrequent
2. occurring or appearing at usually irregular intervals; "episodic in his affections"; "occasional headaches"
(synonym) episodic
(similar) unpredictable
3. employed in a specified capacity from time to time; "casual employment"; "a casual correspondence with a former teacher"; "an occasional worker"
(synonym) casual
(similar) irregular

příd.jm. příležitostný

Przym. sporadyczny

(a.)
Produced by accident; as, the occasional origin of a thing.
  

(a.)
Of or pertaining to an occasion or to occasions; occuring at times, but not constant, regular, or systematic; made or happening as opportunity requires or admits; casual; incidental; as, occasional remarks, or efforts.