_occasio datur, offertur_—a favourable[1] opportunity presents itself.
_occasione data, oblata_—when occasion offers; as opportunity occurs.
_per occasionem_—when occasion offers; as opportunity occurs.
_quotienscunque occasio oblata est; omnibus locis_—on every occasion;
at every opportunity.
_occasionem alicui dare, praebere alicuius rei_ or _ad aliquid
faciendum_—to give a man the opportunity of doing a thing.
_facultatem alicui dare alicuius rei_ or _ut possit..._—to give a man
the opportunity of doing a thing.
_potestatem,_[2] _copiam alicui dare, facere_ with Gen. gerund.—to
give a man the opportunity of doing a thing.
_occasionem nancisci_—to get, meet with, a favourable opportunity.
_occasione uti_—to make use of, avail oneself of an opportunity.
_occasionem praetermittere, amittere_ (through carelessness),
_omittere_ (deliberately), _dimittere_ (through indifference)—to lose,
let slip an opportunity.
_occasioni deesse_[3]—to neglect an opportunity.
_occasionem arripere_—to seize an opportunity.
_facultatem, potestatem alicui eripere, adimere_—to deprive a man of
the chance of doing a thing.
_nulla est facultas alicuius rei_—no opportunity of carrying out an
object presents itself.
_locum dare suspicioni_—to give ground for suspicion.
_ansas dare ad reprehendum, reprehensionis_—to give occasion for
blame; to challenge criticism.
_ansam habere reprehensionis_—to contain, afford matter for criticism.
_adduci aliqua re_ (_ad aliquid_ or _ut..._)—to be induced by a
consideration.
_nescio quo casu_ (with Indic.)—by some chance or other.
_temere et fortuito; forte (et) temere_—quite accidentally,
fortuitously.
[1] Not _occasio opportuna, bona, pulchra_, the notion "favourable"
being contained in the word itself. We find, however, _occasio
praeclara, ampla, tanta_, not unfrequently.
[2] Notice _potestatem alicui pugnandi facere_, to offer battle, and
_potestatem sui facere alicui_, (1) to give opportunity of battle, and
also (2) to grant an audience to (cf. _sui conveniendi potestatem
facere_).
[3] In the same way _deesse officio_, to leave one's duties undone;
_d. muneri_, to neglect the claims of one's vocation; _d. rei
publicae_, to be careless of state interests, to be unpatriotic; _d.
sibi_, not to do one's best.