Infrequently.
1854. He had, some years ago, in connection with his pastorate, a small congregation in the country, to which he preached semi-occasionally, at a private house.Knick. Mag., xliii. 3223 (March).
1854. Jack Cathcart, a former college mate of Eliots and mine, who was, as his parents had every reason to believe by his letters, diligently employed in making himself a scientific physician and surgeon, but, in point of fact, walking the hospitals but semi-occasionally, and seeing life in Paris very constantly; especially that part of it which is to be seen by gas or lamplight.Putnams Magazine, iii. 506/1 (May) (Bartlett).
a. 1854. Semi-occasional intoxication.Dow, Jun., Patent Sermons, iii. 90.
1858. Our mails [arrive] only semi-occasionally, or now and then.Olympia (W.T.) Pioneer, Aug. 27.
1876. The shelves being a foot deep, as many more books or pamphlets that are not to be discarded, but are only wanted semi-occasionally, can be ranged behind the other books and pamphlets.Clarence Cook, Beds and Tables, Stools and Candlesticks, Scribners Mag., xi. 488/2 (Feb.) (Bartlett).